LAW OFFICES
Ballard Spahr Andrews & Ingersoll, LLP
300 East Lombard Street                                               DENVER, CO
Baltimore, MD 21202                                             PHILADELPHIA, PA
410-528-5600                                                  SALT LAKE CITY, UT
FAX: 410-528-5650                                                   VOORHEES, NJ
LAWYERS@BALLARDSPAHR.COM                                          WASHINGTON, DC

                                   Exhibit 5.1
                                                                     FILE NUMBER
                                                                          875770

                                December 20, 2002

Realty Income Corporation
220 West Crest Street
Escondido, California 92025

Re:  Registration Statement on Form S-8
     --------------------------------------------

Ladies and Gentlemen:

     We have served as special Maryland counsel to Realty Income Corporation, a
Maryland corporation (the "Company"), in connection with certain matters of
Maryland law arising out of the registration of 1,000,000 shares (the "Shares")
of common stock, $1.00 par value per share, of the Company (the "Common Stock")
issuable in connection with The 1994 Stock Option and Incentive Plan for Key
Employees of Realty Income Corporation and RIC Advisor, Inc. (the "Plan"),
covered by the Registration Statement on Form S-8 (the "Registration Statement")
filed with the Securities and Exchange Commission (the "Commission") pursuant to
the Securities Act of 1933, as amended (the "1933 Act").

     In connection with our representation of the Company, and as a basis for
the opinion hereinafter set forth, we have examined originals, or copies
certified or otherwise identified to our satisfaction, of the following
documents (hereinafter collectively referred to as the "Documents"):

     1.   The Registration Statement;

     2.   The charter of the Company (the "Charter"), certified as of a recent
          date by the State Department of Assessments and Taxation of Maryland
          (the "SDAT");

     3.   The Bylaws of the Company (the "Bylaws"), certified as of the date
          hereof by an officer of the Company;

     4.   The Plan;

     5.   Resolutions adopted by the Board of Directors of Realty Income
          Corporation, a Delaware corporation ("Realty Income Delaware"),
          relating to the adoption of the Plan (the "1993 Directors'
          Resolutions"), certified as of the date hereof by an officer of the
          Company;


Realty Income Corporation
December 20, 2002
Page Two


     6.   A resolution adopted by the sole stockholder of Realty Income Delaware
          relating to the adoption of the Plan (the "1993 Stockholder
          Resolution"), certified as of the date hereof by an officer of the
          Company;

     7.   Resolutions adopted by the Board of Directors of Realty Income of
          Maryland, Inc., a Maryland corporation ("Realty Income Maryland"),
          relating to the adoption of the Plan (the "1997 Directors'
          Resolutions"), certified as of the date hereof by an officer of the
          Company;

     8.   Resolutions adopted by the sole stockholder of Realty Income Maryland
          relating to the adoption of the Plan (the "1997 Stockholder
          Resolutions"), certified as of the date hereof by an officer of the
          Company;

     9.   Resolutions adopted by the Board of Directors of the Company relating
          to the registration of the Shares (the "1999 Resolutions" and together
          with the 1993 Directors' Resolutions, the 1993 Stockholder Resolution,
          the 1997 Directors' Resolutions and the 1997 Stockholder Resolutions,
          the "Resolutions"), certified as of the date hereof by an officer of
          the Company;

     10.  A certificate of the SDAT as to the good standing of the Company,
          dated as of a recent date;

     11.  A certificate executed by an officer of the Company, dated as of the
          date hereof; and

     12.  Such other documents and matters as we have deemed necessary or
          appropriate to express the opinion set forth in this letter, subject
          to the assumptions, limitations and qualifications stated herein.

     In expressing the opinion set forth below, we have assumed the following:

     1.   Each individual executing any of the Documents, whether on behalf of
          such individual or another person, is legally competent to do so.

     2.   Each individual executing any of the Documents on behalf of a party
          (other than the Company) is duly authorized to do so.

     3.   Each of the parties (other than the Company) executing any of the
          Documents has duly and validly executed and delivered each of the
          Documents to which such party is a signatory, and such party's
          obligations set forth therein are legal, valid and binding and are
          enforceable in accordance with all stated terms.

Realty Income Corporation
December 20, 2002
Page 3


     4.   All Documents submitted to us as originals are authentic. The form and
          content of the Documents submitted to us as unexecuted drafts do not
          differ in any respect relevant to this opinion from the form and
          content of such Documents as executed and delivered. All Documents
          submitted to us as certified or photostatic copies conform to the
          original documents. All signatures on all such Documents are genuine.
          All public records reviewed or relied upon by us or on our behalf are
          true and complete. All statements and information contained in the
          Documents are true and complete. There has been no oral or written
          modification or amendment to any of the Documents, and there has been
          no waiver of any provision of any of the Documents, by action or
          omission of the parties or otherwise.

     5.   The Shares will not be issued or transferred in violation of any
          restriction or limitation contained in the Charter or the Plan.

     Based upon the foregoing, and subject to the assumptions, limitations and
qualifications stated herein, it is our opinion that:

     1.   The Company is a corporation duly incorporated and existing under and
          by virtue of the laws of the State of Maryland and is in good standing
          with the SDAT.

     2.   The Shares have been duly authorized for issuance and, when and if
          issued and delivered against payment therefor and otherwise in the
          manner described in the Registration Statement, the Resolutions and
          the Plan, will be (assuming that, upon any such issuance, the sum of
          (i) all shares of Common Stock issued as of the date hereof, (ii) any
          shares of Common Stock issued between the date hereof and any date on
          which the Shares are actually issued (not including the Shares) and
          (iii) the Shares will not exceed the total number of shares of Common
          Stock that the Company is then authorized to issue under the Charter)
          validly issued, fully paid and nonassessable.

     The foregoing opinion is limited to the substantive laws of the State of
Maryland and we do not express any opinion herein concerning any other law. We
express no opinion as to the applicability or effect of any federal or state
securities laws, including the securities laws of the State of Maryland, or as
to federal or state laws regarding fraudulent transfers. To the extent that any
matter as to which our opinion is expressed herein would be governed by any
jurisdiction other than the State of Maryland, we do not express any opinion on
such matter.

     We assume no obligation to supplement this opinion if any applicable law
changes after the date hereof or if we become aware of any fact that might
change the opinion expressed herein after the date hereof.

     This opinion is being furnished to you solely for your submission to the
Commission as an exhibit to the Registration Statement and, accordingly, may not
be relied upon by, quoted in any manner to, or delivered to any other person or
entity without, in each instance, our prior written consent.


Realty Income Corporation
December 20, 2002
Page 4


     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of the name of our firm therein. In giving
this consent, we do not admit that we are within the category of persons whose
consent is required by Section 7 of the 1933 Act.

                                                     Very truly yours,