UNSECURED PURCHASE PRICE ADJUSTMENT MECHANISM AGREEMENT
             -------------------------------------------------------

     THIS UNSECURED PURCHASE PRICE ADJUSTMENT MECHANISM AGREEMENT (this
"Agreement") is made as of the 26th day of February, 1998, by and among
Meditrust Corporation (the "REIT"), Meditrust Operating Company ("OPCO," and
together with the REIT, the "Companies"), Merrill Lynch International ("MLI"),
Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S") as agent for MLI
and as owner of the Purchase Shares and assignee of the Purchase Agreement
(together with MLI, the "Merrill Lynch Parties"). The Companies and the Merrill
Lynch Parties are referred to herein collectively as the "Parties" and each
individually, as a "Party."

     The Parties hereto entered into the Purchase Agreement (the "Purchase
Agreement") and Purchase Price Adjustment Mechanism Agreement (the "Original
Adjustment Agreement") each dated as of February 26, 1998 and those certain
Amendment Agreements dated as of July 16, July 31 and September 11, 1998
(collectively, the "Amendments"), which Amendments amended the Purchase
Agreement and the Original Adjustment Agreement to the extent set forth therein.
The Parties are executing and delivering an Amended and Restated Settlement
Agreement dated as of November 11, 1998 (the "Settlement Agreement") which sets
forth certain additional agreements and covenants related to the transactions
contemplated by the Purchase Agreement and the Original Adjustment Agreement, as
amended prior to the date hereof. As required thereby, the Parties are entering
into an Amendment to Purchase Agreement, a Secured Purchase Price Adjustment
Mechanism Agreement dated as of February 26, 1998 (the "Secured Adjustment
Agreement") and this Agreement contemporaneously with the execution and delivery
of the Settlement Agreement, which, collectively, are intended to (i) amend and
restate in its entirety the Original Adjustment Agreement, and (ii) rescind the
Amendments in their entirety such that such Amendments are thereafter of no
further force and effect.

     Accordingly, the purpose of this Agreement and the Secured Adjustment
Agreement, collectively, is to amend and restate the Original Adjustment
Agreement, as amended by the Amendments, in its entirety and to set forth the
terms and conditions of the purchase price adjustment transaction (the
"Transaction") entered into between MLI and the Companies.

     IN CONSIDERATION of the mutual representations, warranties and covenants
herein contained, and on the terms and subject to the conditions herein set
forth, the Companies and MLI hereby agree as follows:

1.   Definitions.

     As used in this Agreement, the following terms shall have the meanings set
forth below:

a.   Ability to Settle in Paired Shares. As of the date hereof, the Companies
     have not, and after the date hereof, the Companies will not, enter into any
     obligation that would contractually prohibit the Companies from delivering
     Paired Shares pursuant to Sections 3.2, 4.2 or 5 of this Agreement.



b.   Adjustment Shares. 5,855,000 Paired Shares, as may be adjusted from time to
     time pursuant to Section 1(c) or Section 4.1(d), reduced by the number of
     Settlement Shares that are the subject of Settlement pursuant to Section
     3.1 or Section 4.1 or by the number of Paired Shares delivered to the
     Companies pursuant to Section 3.3(c).

c.   Certain Adjustments to Reference Price or Number of Adjustment Shares. In
     the event of:

          (i)  a subdivision, consolidation or reclassification of the Paired
               Shares, or a free distribution or dividend of any Paired Shares
               to all existing holders of Paired Shares by way of bonus,
               capitalization or similar issue;

          (ii) a distribution or dividend to all existing holders of Paired
               Shares of (A) additional Paired Shares or (B) other share capital
               or securities granting right to payment of dividends and/or the
               proceeds of liquidation of the Companies equally or
               proportionally with such payments to holders of Paired Shares, an
               adjustment shall thereupon be effected to the Reference Price
               and/or the Adjustment Shares at the time of such event with the
               intent that following such adjustment, the value of this
               Transaction is economically equivalent to the value immediately
               prior to the occurrence of the event causing the adjustment.

     (cA) Blackout Day. Means any day on which the Companies shall have (i)
          suspended the right of the Merrill Lynch Parties to effect sales of
          the Shares through the use of a Prospectus Supplement until such time
          as a Prospectus Supplement has been filed by the Companies with the
          Commission, or an amendment to the Registration Statement has been
          filed by the Companies and declared effective by the Commission, or
          until such time as the Companies have filed an appropriate report with
          the Commission pursuant to the Exchange Act, or (ii) failed to take
          any actions required of the Companies under the Forward Equity
          Transaction Documents (as defined in the Settlement Agreement) to
          enable the Merrill Lynch Parties to publicly sell Paired Shares under
          this Agreement including, without limitation, the failure of the
          Company to (i) maintain an effective registration statement covering
          such Paired Shares (whether or not such failure is due to regulatory
          review), (ii) provide the Merrill Lynch Parties with a deliverable
          Prospectus and/or Prospectus Supplement, or (iii) provide the
          appropriate Resale Closing Documents (as defined in the Purchase
          Agreement, as amended by the Amendment to Purchase Agreement).

d.   Block Sale. Any privately negotiated sales of the Paired Shares involving
     at least a block of such security (as defined in Rule 10b18 under the
     Exchange Act) that are not effected to or through a broker or dealer.


                                        2



e.   Business Day. Any day other than Saturday, Sunday, or any other day on
     which banking institutions in the States of Delaware or New York are not
     open for business.

f.   Calculation Agent. MLI, whose calculations and determinations shall be made
     in a reasonable manner.

     (fA) Cash Payment Amount. Means, on each Reset Date or Interim Settlement
          Date, an amount in U.S. Dollars equal to:

          (i)  the sum of all per Paired Share cash amounts paid or delivered by
               the Companies to MLI under Section 3.3 (other than amounts that
               reduce the Adjustment Shares pursuant to Section 3.3(c)) during
               the relevant Compounding Period; the per Paired Share amount to
               be determined by dividing the amount of cash delivered pursuant
               to Section 3.3 by the number of Adjustment Shares on the date so
               paid or delivered; plus (ii) an amount representing interest that
               could have been earned on such cash amounts at the USD LIBOR rate
               having a designated maturity of 1 month, plus 75 basis points,
               for the period from the date that such cash amounts are received
               by MLI until such Reset Date or Interim Settlement Date.

g.   Closing Price. The last sale price of the Paired Shares on the Relevant
     Exchange on the relevant date.

     (gA) Collateral Account. Means the collateral account in the name of the
          Meditrust Corporation Pledged Collateral for MLI at MLPF&S. The
          Collateral Account as of the date hereof is Acct. #51L10522 at MLPF&S.

h.   Commission. The Securities and Exchange Commission.

i.   Compounding Period. Means each period commencing on and including:

          (i)  in the case of the first Compounding Period, the Initial
               Settlement Date and ending on but excluding the first Reset Date,
               and

          (ii) for each period thereafter, a Reset Date and ending on (but
               excluding) the next following Reset Date.

j.   [Intentionally Omitted]

k.   Distribution Amount. Means, on each Reset Date or Interim Settlement Date,
     an amount in U.S. Dollars equal to:


                                        3



          (i)  the sum of all cash distributions paid on a single Paired Share
               during the relevant Compounding Period; plus

          (ii) an amount representing interest that could have been earned on
               such distributions at the USD LIBOR rate having a designated
               maturity of 1 month, plus 75 basis points, for the period from
               the date that such distributions would have been received by a
               holder of such number of Paired Shares until such Reset Date or
               Interim Settlement Date.

l.   DRIP Distribution. Sales to any Distribution Reinvestment Plan now or
     hereafter established by the Companies, or to any agent acting on behalf of
     such Plan, for sale to participants in such Plan.

m.   Effective Date. February 26, 1998.

     (mA) [Intentionally Omitted]

n.   Exchange Act. The Securities Exchange Act of 1934, as amended.

o.   Exchange Trading Day. Each day on which the Relevant Exchange is open for
     trading.

p.   Execution Price. The Closing Price on the Effective Date.

q.   Gradual Market Distribution. An offering of the Paired Shares into the
     existing trading market for outstanding shares of the same class at other
     than a fixed price on or through facilities of a national securities
     exchange or to or through a market maker otherwise than on an exchange.

r.   Initial Price. Means,

          (i)  for the Compounding Period ending on May 31, 1998, an amount in
               U.S. Dollars equal to $32.625, and

          (ii) for each subsequent Reset Date, the Reference Price as calculated
               on or adjusted as of the prior Reset Date.

s.   Initial Settlement Date. February 26, 1998.

     (sA) Interim Settlement Date. Means (i) each Tuesday until the Reference
          Amount has been reduced to zero dollars and (ii) any day on which cash
          amounts are paid or delivered to MLI under Section 3.3; provided that
          if such date is not an Exchange Trading Day, then the Interim
          Settlement Date shall be the next succeeding Exchange Trading Day.


                                        4



t.   Interim Settlement Amount. With respect to a given Interim Settlement Date,
     means the amount by which the Reference Amount minus $10,000,000 exceeds
     the product of (x) the Closing Price and (y) the number of Adjustment
     Shares.

u.   Interim Settlement Shares. The Interim Settlement Amount divided by the
     Closing Price on such Reset Date or Interim Settlement Date.

v.   Maturity Date. February 26, 1999.

w.   Paired Shares. Units consisting of one share of common stock, $.10 par
     value per share, of the REIT and one share of common stock, par value $.10
     per share, of OPCO, which shares are paired and traded as a unit.

x.   Relevant Exchange. Means, with respect to any Exchange Trading Day, the
     principal Stock Exchange on which the Paired Shares are traded on that day.

y.   Reference Amount. On each Reset Date and Interim Settlement Date, the
     Reference Price multiplied by the Adjustment Shares or Settlement Shares,
     as applicable.

z.   Reference Price. On each Reset Date and Interim Settlement Date, the
     Reference Price shall be determined by:

          (i)  compounding the Initial Price for each Compounding Period at USD
               LIBOR rate plus Spread for a designated maturity of 1 month
               (Actual/360 day count fraction) to such Reset Date and Interim
               Settlement Date;

          (ii) subtracting the Distribution Amount at that date; and

          (iii) subtracting the Cash Payment Amount at that date.

aa.  Reset Date. Means, through the final Settlement Date, (i) the last day of
     each month, beginning May 31,1998 (provided, that if such day is not a
     Business day then the Reset Date shall be the next succeeding Business Day)
     and (ii) as to any Settlement Shares, the Settlement Date that such
     Settlement Shares are settled.

bb.  Securities Act. The Securities Act of 1933, as amended.

cc.  Settlement. Has the meaning set forth in Section 3.1 or Section 4.1, as
     applicable.

dd.  Settlement Amount. The net sales proceeds realized by or on behalf of MLI
     for all sales of Paired Shares in connection with any Settlement,
     calculated as follows:

          (i)   if the manner of Settlement Sale pursuant to Section 3.1 or 4.1
                is an Underwritten Offering, the Settlement Amount will equal 
                the gross proceeds realized, net of a negotiated underwriting
                discount;


                                        5



          (ii)  if the manner of Settlement Sale pursuant to Section 3.1 or 4.1
                is a Block Sale, the Settlement Amount will equal the gross 
                sales proceeds realized, net of a negotiated underwriting 
                discount;

          (iii) if the manner of Settlement Sale pursuant to Section 3.1 or 4.1
                is a Gradual Market Distribution, the Settlement Amount will
                equal the gross sales proceeds realized from sales to the market
                over the period of the distribution, net of a resale spread of
                50 basis points;

          (iv)  if the manner of Settlement Sale pursuant to Section 3.1 or 4.1
                is a DRIP Distribution, the Settlement Amount will equal the
                gross sales proceeds realized from sales to any Purchase Agent
                for a Company Distribution Reinvestment Plan, net of a resale
                spread of 50 basis points; 

          (v)   if the manner of Settlement Sale pursuant to Section 3.1 is a 
                Subscription Distribution, the Settlement Amount will equal the
                gross proceeds realized, net of any fees, discounts or other
                costs incurred by the Companies in connection with such
                Subscription Distribution.

          ee.  Settlement Date. The date on which, in accordance with standard
               market practice, the Paired Shares are delivered and the funds
               received, in respect of any Settlement in accordance with Section
               3.2 or Section 4.2.

          ff. [Intentionally Omitted].

          gg.  Settlement Shares. The number of Adjustment Shares subject to
               Settlement.

          hh.  Spread. 75 basis points, subject to adjustment pursuant to
               Section 6.5 of this Agreement, Section 7 of the Settlement
               Agreement and Section 5.2 of the Purchase Agreement, as amended
               by the Amendment to Purchase Agreement.

          ii.  Stock Exchange. Means the New York Stock Exchange, the American
               Stock Exchange or NASDAQ.

          jj.  Underwritten Offering. An underwritten fixed price offering of
               the Paired Shares.

          kk.  USD LIBOR. The London Inter Bank Offered Rate in respect of U.S.
               Dollars for the designated maturity as quoted on Page 3750 on the
               Telerate Service (or such other page as may replace Page 3750 on
               that service) as of 11:00 a.m., London time, on the date on which
               it is to be determined.

          ll.  Subscription Distribution. An offering of the Paired Shares to
               existing holders of the Paired Shares.


                                        6



2. Representations and Warranties.
   -------------------------------

     The representations and warranties of the Companies in Section 4 of the
Purchase Agreement, dated as of February 26, 1998 (the "Purchase Agreement"),
among the Companies, MLI and MLPF&S are hereby incorporated by reference herein
as of the date hereof, and the Companies hereby so represent and warrant to MLI
as of the date hereof. The provisions of Section 6 of the Purchase Agreement
shall also be applicable to any Paired Shares delivered to MLI under this
Agreement.

3. Settlement by or at the Companies' Direction.
   ---------------------------------------------

a.   Settlement Sale.

     Subject to Section 4.2(a)(ii), on any Reset Date or on any other Exchange
Trading Date agreed by both parties, up to and including the Maturity Date, the
Companies may give telephonic notice to MLI to settle, and MLI shall settle, in
a commercially reasonable manner (which may require sales over a period of more
than 1 day), all or a portion of the Adjustment Shares ("Settlement"), as
specified by the Companies, through sale of not less than the number of Paired
Shares, the sale of which would result in a Settlement Amount equal to 100% of
the Reference Amount on the Settlement Date, and not more than the number of
Paired Shares, the sale of which would result in a Settlement Amount equal to
105% of the Reference Amount on the Settlement Date, in any of the manners set
forth below, as selected by the Companies:

          (i)   an Underwritten Offering (for which the Companies shall provide
                at least 21 Business Days prior notice to MLI);

          (ii)  a Block Sale (for which the Companies shall provide at least 3
                Business Days prior notice to MLI);

          (iii) a Gradual Market Distribution (for which the Companies shall
                provide at least 1 Business Days prior notice to MLI);

          (iv)  a DRIP Distribution (for which the Companies shall provide at
                least 1 Business Days prior notice to MLI); or

          (v)   a Subscription Distribution (for which the Companies shall
                provide at least 5 Business Days prior notice to MLI).

     If the Companies do not specify a manner of sale, a Gradual Market
Distribution shall be used. Settlement procedures shall begin as soon as
commercially practicable, as determined by MLI, after MLI receives notice from
the Companies and no later than the first Exchange Trading Day after expiration
of the notice period unless otherwise agreed by the Companies and MLI. At such
time as the Companies deliver notice pursuant to this Section 3.1, the Companies
may direct MLI to sell not less than the number of Paired Shares equal to the
number of Settlement Shares, and MLI shall comply with such direction in a
commercially reasonable manner.


                                        7





b.   Settlement Mechanics.

          i.   If, on the Settlement Date, the Settlement Amount is greater than
               the Reference Amount, MLI will pay the Companies an amount in
               cash or Paired Shares (valued at the Closing Price on the
               Settlement Date) equal to the difference.

          ii.  If the number of Paired Shares sold by MLI pursuant to Section
               3.1 is greater than the number of Settlement Shares, the
               Companies shall deliver to MLI, on the Settlement Date, a number
               of Paired Shares equal to the difference. If the number of Paired
               Shares sold by MLI pursuant to Section 3.1 is less than the
               number of Settlement Shares, MLI shall deliver to the Companies,
               on the Settlement Date, a number of Paired Shares equal to the
               difference.

          iii. In all events, MLI will pay to the Companies an amount equal to
               all cash distributions received by MLI that are payable to
               holders of the Paired Shares but not paid prior to the Settlement
               Date, on a number of Paired Shares equal to the Settlement
               Shares, on the Business Day after the relevant distribution
               payment date declared by the Board of Directors of the REIT and
               OPCO.

          iv.  If MLI, in connection with any Settlement, receives net sales
               proceeds, as calculated pursuant to the definition of Settlement
               Amount, from the sale of Paired Shares prior to the applicable
               Settlement Date, MLI, on the Settlement Date, shall pay the
               Companies an amount in cash representing interest that could have
               been earned on such net sales proceeds at the USD LIBOR rate
               having a designated maturity of 1 month, plus 75 basis points,
               for the period from the date that such net sales proceeds are
               received by MLI until such Settlement Date.

c.   Cash Payments.

          i.   Notwithstanding anything provided herein or in the Purchase
               Agreement or the Settlement Agreement, the Companies shall have
               the right to pay or otherwise deliver cash to MLI to reduce the
               Reference Amount (by reducing the Reference Price on a per
               Adjustment Share basis) and the date of such payment or delivery
               shall constitute an Interim Settlement Date and MLI shall deliver
               or cause to be delivered to the Companies any Interim Settlement
               Shares as required by Section_5(b) hereof.

          ii.  Any cash paid or otherwise delivered to MLI pursuant to Sections
               4.2(a)(i) and 5(c) of this Agreement, Sections 4.2(ii), 4.3, 5,
               6.3(b), 6.4, 7(b), 8.1 and 9 of the Settlement Agreement and
               Section 5.2 of the Purchase Agreement, as amended by the
               Amendment to Purchase Agreement, shall, in each case, reduce the
               Reference Amount (by reducing the Reference


                                        8



               Price on a per Adjustment Share basis) and the date of any such
               payment or delivery shall constitute an Interim Settlement Date
               and MLI shall deliver or cause to be delivered to the Companies
               any Interim Settlement Shares as required by Section 5(b) hereof.

          iii. In the event that on the date of any cash payment contemplated by
               Section 3.3(a) or 3.3(b) no such Interim Settlement Shares are
               held in the Collateral Account or after giving effect to the
               application of any cash payment no such Interim Settlement Shares
               will be held in the Collateral Account, the Merrill Lynch Parties
               shall deliver, or cause to be delivered, within five (5) Business
               Days to the Companies, in addition to any Interim Settlement
               Shares required to be delivered, that number of Paired Shares
               then held by the Merrill Lynch Parties pursuant to the Purchase
               Agreement or this Agreement in excess of that number of Paired
               Shares determined by dividing the Reference Amount (after
               deducting any such cash payment not applied in respect of Interim
               Settlement Shares) by the Closing Price on the date of such
               payment or transfer. Any such delivery of excess Paired Shares
               other than Interim Settlement Shares shall reduce the number of
               Adjustment Shares by the number of Paired Shares so delivered.

4.   Settlement by the Merrill Lynch Parties.

     a.   Settlement Sales.

          i.   After the Standstill (as defined in the Settlement Agreement)
               ends, MLI shall have the right to sell in any of the manners set
               forth in Section 3.1 or 4.1(b) hereof (the "Settlement") 100% of
               the Adjustment Shares and in connection therewith to sell a
               number of Paired Shares equal to the number of Paired Shares
               purchased by MLI pursuant to the Purchase Agreement (the
               "Original Shares") and any and all Interim Settlement Shares. MLI
               shall be entitled to continue settlement procedures and the
               Companies shall continue to deliver Interim Settlement Shares
               pursuant to Section 5 hereof (if required) and otherwise perform
               the Companies' obligations under this Agreement until the
               Reference Amount has been reduced to zero or until the Companies
               make a cash payment to MLI in settlement of the remaining
               Reference Amount.

          ii.  The Companies and MLI agree that sales of Paired Shares will be
               made in a commercially reasonable manner, which may include
               private or public sales and Block Sales at discounts to current
               market prices that, in MLI's judgment, are commercially
               reasonable and appropriate at the time of such sales.
               Notwithstanding the foregoing, if MLI proposes to make a sale of
               750,000 or more Paired Shares to a single purchaser in a single
               transaction


                                        9



               or series of transactions, other than through the facilities of
               the New York Stock Exchange at prevailing market prices, it shall
               first notify the Companies of the material terms of such sale
               (including the number of Paired Shares and the proposed price per
               Paired Share, which may, subject to the preceding sentence, be
               based upon a discount to the closing or other identified price or
               other relevant measure) and the Companies shall then have the
               right to purchase (or to designate one or more purchasers for)
               such Paired Shares on such terms; provided, however, that if the
               Companies (or their designee(s)) shall fail to commit to such
               purchase (i) if MLI gives the Companies notice prior to 12:00
               p.m. New York City time on an Exchange Trading Day, prior to 4:30
               p.m. New York City time on the day on which MLI gives the
               Companies notice of the proposed sale as provided above (or the
               next succeeding Business Day if the day of the delivery of such
               notice is not a Business Day), (ii) if MLI gives the Companies
               notice on or after 12:00 p.m. and before 6:00 p.m., prior to 9:00
               a.m. New York City time on the Exchange Trading Day following the
               day on which MLI gives the Companies notice of the proposed sale
               as provided above or (iii) if such sale involves 2,000,000 or
               more Paired Shares to be sold in a single transaction,
               notwithstanding the provisions of clauses (i) and (ii) above,
               within 24 hours (excluding hours in non-Business Days) of the
               time at which MLI gives the Companies notice of the proposed sale
               as provided above, MLI may proceed to effect such sale on the
               proposed terms with such purchaser or purchasers as it selects.

          iii. At the option of MLI, subject to the ownership limitation
               provisions of Section 6.2 hereof, (i) all right, title and
               interest to Interim Settlement Shares having a value (based on
               the Closing Price on such date) equal to (x) the Reference Amount
               on such date less (y) an amount equal to the Adjustment Shares
               multiplied by the Closing Price on such date shall be transferred
               to MLI and (ii) such Interim Settlement Shares shall be
               transferred to an account at MLPF&S in the name of and for the
               exclusive benefit of MLI (the "MLI Account"). The number of
               Paired Shares in the MLI Account in excess of the number of
               Paired Shares equal to the Adjustment Shares (the "Additional
               Shares") shall continue to be treated as Interim Settlement
               Shares for purposes of this Agreement.

          iv.  Upon reduction of the Reference Amount in the Secured Adjustment
               Agreement to zero (-0-) dollars through the payment of cash by
               the Companies to MLI: (i) a Reset Date shall occur, (ii) the
               lesser of (x) 2,645,000 Paired Shares or (y) such number of
               Paired Shares as remains in the Collateral Account shall be
               transferred to the MLI Account, (iii) the number of Adjustment
               Shares shall be increased by such number of Paired Shares
               determined pursuant to clause (ii) above, and (iv) the Reference
               Price shall be recalculated by multiplying the Reference Price
               determined


                                       10



               as of such Reset Date by the quotient of (x) the number of
               Adjustment Shares immediately prior to such transfer pursuant to
               clause (ii) above divided by (y) the number of Adjustment Shares
               calculated pursuant to clause (iii) above.

          v.   The transfer of Additional Shares pursuant to Section 4.1(c) or
               the transfer of Paired Shares pursuant to Section 4.1(d) shall
               constitute the purchase of a securities entitlement from the
               Companies for value by MLI and the transfer of all right, title
               and interest in and to the Additional Shares to MLI, and after
               such transfer MLI shall be the owner of such Additional Shares
               for all purposes.

b.   Settlement Mechanics.

          i.   (i)  After November 11, 1998 and any Business Day thereafter, any
                    and all cash amounts in the Collateral Account (if any)
                    shall be transferred to MLI to reduce the Reference Amount.

               (ii) After November 11, 1998, the Companies can no longer direct
                    the settlement of Adjustment Shares pursuant to Section 3.1
                    of this Agreement without the Merrill Lynch Parties'
                    consent.

          ii.  [Intentionally omitted]

          iii. If, on the Settlement Date, the Settlement Amount is greater than
               the Reference Amount, MLI will pay the Companies an amount in
               cash equal to the difference.

          iv.  In all events, MLI will pay to the Companies an amount equal to
               all cash distributions received by MLI that are payable to
               holders of the Paired Shares but not paid prior to the Settlement
               Date, on a number of Paired Shares equal to the Settlement
               Shares, on the Business Day after the relevant distribution
               payment date declared by the Boards of Directors of the REIT and
               OPCO.

          v.   If the number of Paired Shares sold by MLI pursuant to Section
               4.1 is greater than the number of Settlement Shares, the
               Companies shall deliver to MLI, on the Settlement Date, a number
               of Paired Shares equal to the difference. If the number of Paired
               Shares sold by MLI pursuant to Section 4.1 is less than the
               number of Settlement Shares, MLI shall deliver to the Companies,
               on the Settlement Date, a number of Paired Shares equal to the
               difference.

          vi.  If MLI, in connection with any Settlement, receives net sales
               proceeds, as calculated pursuant to the definition of Settlement
               Amount, from the sale of Paired Shares prior to the applicable
               Settlement Date, MLI, on the Settlement Date, shall pay the
               Companies an amount in cash representing interest that could have
               been earned on such net sales proceeds at the USD LIBOR rate
               having a designated maturity of 1 month, plus 75 basis points,


                                       11



               for the period from the date that such net sales proceeds are
               received by MLI until such Settlement Date.

5.   Interim Settlements.

          i.   On and after November 11, 1998, within 5 Business Days following
               each Reset Date or Interim Settlement Date, as the case may be,
               the Companies shall deliver to the Collateral Account an amount
               of Paired Shares as follows:

               (i)  During the pendency of the Standstill, 125% of the Interim
                    Settlement Amount in Interim Settlement Shares;

               (ii) After the Standstill, 100% of the Interim Settlement Amount
                    in Interim Settlement Shares unless, subject to clause (iii)
                    below, the date on which such Interim Settlement Shares are
                    delivered is a Black-Out Day, in which case, 150% of the
                    Interim Settlement Amount in Interim Settlement Shares;

               (iii) If the date on which such Interim Settlement Shares are
                     delivered is a Black-Out Day due to regulatory delays, as
                     described in Section 5.2 of the Purchase Agreement, as
                     amended by the Amendment to Purchase Agreement, and the
                     Companies shall have elected to deliver additional Interim
                     Settlement Shares and to increase the Spread rather than
                     delivering the $25 million payment contemplated therein,
                     the greater of (A) 200% of the Interim Settlement Amount in
                     Interim Settlement Shares, or (B) that number of Interim
                     Settlement Shares such that such number of Interim
                     Settlement Shares plus any Interim Settlement Shares and
                     Adjustment Shares then held by the Merrill Lynch Parties
                     valued at the Closing Price on such Reset Date or Interim
                     Settlement Date will equal at least 120% of the Reference
                     Amount.

     Notwithstanding the foregoing, in the event that on any Reset Date there
are Interim Settlement Shares in the Collateral Account, then such Interim
Settlement Shares shall be deemed redelivered to the Collateral Account pursuant
to the preceding sentence. Interim Settlement Shares shall be registered in the
stock register of the Companies as instructed by MLI and shall be held by MLPF&S
or a custodian or depository designated by MLPF&S.

          ii.  On any Interim Settlement Date, if Interim Settlement Shares are
               held by MLI, MLI shall deliver to the Companies within five (5)
               Business Days after such Reset Date, the amount in Interim
               Settlement Shares by which the amount in Interim Settlement
               Shares held by MLI (valued at the Closing Price on such Reset
               Date) plus any cash amounts in the Collateral Account exceeds the
               required number of Interim Settlement Shares provided for in
               ss.5(a).


                                       12



          iii. As provided by Section 5 of the Settlement Agreement,
               Distributions on the Interim Settlement Shares will be paid to
               MLI pursuant to ss.3.3 hereof.

          iv.  Once the Reference Amount is reduced to zero (-0-) dollars, MLI
               shall immediately release all claims to any Interim Settlement
               Shares not used in Settlement and deliver such Interim Settlement
               Shares to the Companies.

          v.   The Companies and the Merrill Lynch Parties confirm that the
               Companies have granted to the Merrill Lynch Parties and that the
               Merrill Lynch Parties have a first priority security interest in
               any and all Interim Settlement Shares and any and all cash
               amounts heretofore or hereafter delivered to the Merrill Lynch
               Parties or their respective agent and held in the Collateral
               Account pursuant to this Section 5. MLPF&S acknowledges that it
               is holding and will hold any and all Interim Settlement Shares
               and any and all cash (if any) now or hereafter held in the
               Collateral Account pursuant to Section 5 of this Agreement as
               pledge agent and bailee on behalf of the Merrill Lynch Parties as
               pledgee.

6.   Certain Covenants and Other Provisions.

     a.   Par Value.

     MLI shall pay to the Companies $.10 par value per share for each share
comprising a Paired Share delivered to MLI pursuant to this Agreement.

     b.   Limitation on Ownership of Paired Shares.

     MLPF&S will manage the settlement process in such a way as to ensure that
the Merrill Lynch Parties combined not be the beneficial owner, or be deemed to
be the beneficial owner, at any given time of a number of Paired Shares that is
greater than 9.25% of the Companies' outstanding Paired Shares.

     c.   Allocation of Payments by the MLI.

     When making any payment to the Companies pursuant to this Agreement, MLI
shall allocate such payment between the REIT and OPCO in the manner specified by
the Companies.

     d.   Purchase Price Adjustment Treatment

     The Companies and the MLI agree, to the extent relevant to their respective
business and commercial activities and in the absence of an administrative
determination or judicial ruling to the contrary, to treat for United States
federal income tax and financial accounting purposes


                                       13



payments and deliveries made under this Agreement as adjustments to the purchase
price paid for the Purchase Shares pursuant to Section 2 of the Purchase
Agreement.


     e. Registration Statement.

     Any Paired Shares delivered by the Companies to MLI pursuant to this
Agreement shall be the subject of an Effective Registration Statement. The
Companies further agree that they will cause any registration statement to
remain in effect until the earliest of the date on which (i)<0- 95>the
Adjustment Shares plus all Interim Settlement Shares have been sold by or on
behalf of MLI, (ii) MLI has advised the Companies that it no longer requires
that such registration be effective or (iii) the date on which the Reference
Amount shall have been reduced to zero (-0-). The provisions of Section 5.2 and
Section 7.2 of the Purchase Agreement shall be deemed to apply to any
registration statement filed by the Companies pursuant to this Agreement.

     f. Delivery of Paired Shares.

     The Companies covenant and agree with MLI that Paired Shares delivered by
the Companies pursuant to settlement events in accordance herewith will be duly
authorized, validly issued, fully paid and nonassessable. The issuance of such
Paired Shares will not require the consent, approval, authorization,
registration, or qualification of any government authority, except such as shall
have been obtained on or before the delivery date to MLI in connection with any
registration statement filed with respect to any such Paired Shares.

     g. Securities Law Compliance.

     Each party agrees that it will comply, in connection with this Transaction
and all related or contemporaneous sales and purchases of the Companies' Paired
Shares, with the applicable provisions of the Securities Act, the Exchange Act
and the rules and regulations thereunder and any rules or regulations or code of
conduct of, or agreements with, (i) the National Association of Securities
Dealers, Inc., and (ii) the Relevant Exchange.

     h. Regulatory Compliance.

     Each party agrees that if the delivery of Paired Shares upon settlement is
subject to any restriction imposed by a regulatory authority, it shall not be an
event of default, and the parties will negotiate in good faith a procedure to
effect settlement of such shares in a manner which complies with any relevant
rules of such regulatory authority and which is satisfactory in form and
substance to their respective counsel, subject to Section 6.2 of this Agreement
and Section 7 of the Purchase Agreement. Each party further agrees that any sale
pursuant to Section 3.1 of this Agreement may be delayed or postponed if, in
MLPF&S's judgement, such delay or postponement is necessary to comply with the
requirements of applicable law or regulation.


                                       14



     i. Settlement Transfer.

     All settlements shall occur through DTC or any other mutually acceptable
depository.

     j. Trading Authorization.

     The following individuals and/or any individual authorized in writing by
the respective Treasurers of the Companies are authorized by the Companies to
provide trading instructions to MLI with regard to this transaction.


                                  For the REIT:
                                  -------------

                                  David Benson
                                  Laurie Gerber
                                Michael Benjamin
                                 Michael Bushee

                                    For OPCO:
                                    ---------

                                  William Baker
                                  David Benson
                                  Laurie Gerber
                                Michael Benjamin

     The address, telephone number and facsimile number of each of these
individuals is: c/o The Meditrust Companies, 197 First Avenue, Needham,
Massachusetts 02194, telephone: (781) 4336000, and facsimile: (781) 4331290.

     k. Specific Performance.

     The parties acknowledge and agree that the failure of the Companies or MLI
to deliver Paired Shares in accordance with the provisions hereof would result
in damage to the other party that could not be adequately compensated by a
monetary award. The parties therefore agree that, if either party fails to
deliver Paired Shares in accordance with the provisions hereof, the other party
may, in addition to all other remedies, seek an order of specific performance
from a court of appropriate jurisdiction.


                                       15



     l. Governing Law.

     The Agreement will be governed by and construed in accordance with the laws
of the State of New York without reference to choice of law doctrine.

     m. Confidentiality.

     Subject to the other applicable subsections of this Section 6, to any
contrary requirement of law and to the right of each party to enforce its rights
hereunder in any legal action, each party shall keep strictly confidential and
shall cause its employees and agents to keep strictly confidential the terms of
this Agreement and any information relating to or concerning the other party
which it or any of its agents or employees may acquire pursuant to, or in the
course of performing its obligation under, any provision of this Agreement.

     n. Return of Paired Shares and Cash Collateral.

     Upon the date on which the Reference Amount has been reduced to zero, MLI
shall (i) transfer, assign and deliver to the Companies any cash and/or Paired
Shares previously delivered by the Companies pursuant to this Agreement
(including Paired Shares delivered pursuant to the Purchase Agreement) and not
previously delivered to the Companies or sold by the Merrill Lynch Parties
pursuant to the Restated Adjustment Agreements or, in the case of cash, applied
to reduce the Reference Amount, and (ii) release all claims to cash and Interim
Settlement Shares then held in the Collateral Account (including interest earned
thereon) and immediately deliver such amounts and all Interim Settlement Shares
to the Companies.

     o. Reservation of Rights.

     The Parties hereto expressly reserve their rights with respect to any
actions taken under the Forward Equity Transaction Documents (as defined in the
Settlement Agreement) prior to the date hereof, except that the Parties agree
that the Registration Statement declared effective on October 8, 1998 shall
constitute a Resale Registration Statement as contemplated by the Purchase
Agreement.


                                       16




IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
by their duly authorized representatives as of the day and year first above
written.

                                            MERRILL LYNCH INTERNATIONAL

                                            By: /s/ John O'Dowd
                                                 ------------------------------
                                                Name:  John O'Dowd
                                                Title: Vice President

                                            MERRILL LYNCH, PIERCE, FENNER
                                            & SMITH INCORPORATED

                                            By:  /s/ Onu Odim
                                                 ------------------------------
                                                Name:  Onu Odim
                                                Title: Managing Director


                                            MEDITRUST OPERATING COMPANY

                                            By:  /s/ William Baker
                                                 ------------------------------
                                                Name:  William C. Baker
                                                Title: President


                                            MEDITRUST CORPORATION

                                            By: /s/ Michael Benjamin
                                               ------------------------------
                                               Name:  Michael S. Benjamin, Esq.
                                               Title: Senior Vice President



                                       17