Exhibit (a)(3)




September 27, 2007


TO:           UNIT HOLDERS OF NATIONAL PROPERTY INVESTORS 4

SUBJECT:      OFFER TO PURCHASE UNITS

Dear Unit Holder:

As  described  in  the  enclosed  Offer  to  Purchase  and  related  Letters  of
Transmittal   (the  "Offer")  the   Purchasers   named  in  the  attached  Offer
(collectively  the  "Purchasers") are offering to purchase up to 12,000 Units of
limited partnership interest (the "Units") in NATIONAL PROPERTY INVESTORS 4 (the
"Partnership") at a purchase price equal to:

                                  $250 per Unit

The Offer will provide you with an  opportunity  to liquidate  all, or a portion
of,  your  investment  in  NATIONAL  PROPERTY  INVESTORS  4  without  the  usual
transaction  costs  associated  with market sales or partnership  transfer fees.
Reasons you may wish to sell your Units include:

   o  UNCERTAINTY  OF PARTNERSHIP  TERMINATION.  Our offer provides you with the
      opportunity  to receive a guaranteed  amount of money in a specified  time
      period.  The general  partner has given no indication when the partnership
      will be liquidating.  Additionally, the Partnership's term extends through
      December 31, 2022.  Therefore,  investors  may not see  liquidity for some
      time.

   o  ILLIQUIDITY OF UNITS. The relative illiquidity of the Units resulting from
      the absence of a formal trading market makes the Units difficult to sell.

   o  NO FUTURE  IRS  FILING  REQUIREMENTS.  The tax year in which you sell your
      Units will be the final year for which you will be obligated to file a K-1
      for the Partnership  with your tax return.  This may represent a reduction
      in costs associated with filing complicated tax returns.  Your decision to
      sell  may  have  other  favorable  or  unfavorable  tax  consequences  and
      potential sellers should consult their individual tax advisers.

   o  ELIMINATION  OF RETIREMENT  ACCOUNT FEES. If you sell your Units,  you may
      avoid  incurring fees for having this investment in your IRA or retirement
      account.  Because  many  custodians  have  transfer  restrictions  against
      limited  partnership units or charge additional fees for holding this type
      of asset, many investors are faced with the task of searching for a way to
      avoid  these  fees.  Once  our  cash  payment  is  sent  directly  to your
      retirement  account,  you are free to consolidate your retirement accounts
      or transfer the funds to a custodian that offers lower fees.

After  carefully  reading the enclosed Offer, if you elect to tender your Units,
mail (using the  enclosed  pre-addressed,  postage  paid  envelope) or fax (then
mail) a duly completed and executed copy of the Letter of  Transmittal  (printed
on pink paper) and change of address forms, and any other documents  required by
the Letter of Transmittal, to the Depositary for the Offer at:

                         MacKenzie Patterson Fuller, LP
                               1640 School Street
                            Moraga, California 94556
                            Facsimile: (925) 631-9119

If you have any  questions or need  assistance,  please call the  Depositary  at
800-854-8357.

This Offer expires (unless extended) November 9, 2007.