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                                                                  Exhibit 10.22

                                   AMENDMENT
                                       TO
                        AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                        SIERRA PACIFIC DEVELOPMENT FUND

Section 11.2 of the Partnership Agreement is amended to read as follows:

         "11.2: The Partnership will not sell or lease any [Project] or
         [Project Interest] to the General Partners or their affiliates;
         provided that the foregoing shall not apply to the proposed merger,
         sale or other transfer of properties in connection with the
         consolidation as described in the Proxy/Consent Solicitation Statement
         of the Partnership dated [ ]."<PAGE>   1

                                                                  Exhibit 10.23

                                   AMENDMENT
                                      TO
                       AGREEMENT OF LIMITED PARTNERSHIP
                     OF SIERRA PACIFIC DEVELOPMENT FUND II

Section 11.2 of the Partnership Agreement is amended to read as follows:

         "11.2    Sales and Leases to the General Partners. The Partnership
         shall not sell or lease any property to the General Partners or their
         Affiliates; provided that the foregoing shall not apply to the
         proposed merger, sale or other transfer of properties in connection
         with the consolidation as described in the Proxy/Consent Solicitation
         Statement of the Partnership dated [_]."<PAGE>   1

                                                                  Exhibit 10.24

                                   Amendment
                                      to
                       Agreement of Limited Partnership
                                      of
                      Sierra Pacific Development Fund III

Section 11.2 of the Partnership Agreement is amended to read as follows:

         "11.2 Sales and Leases to the General Partners. The Partnership
         shall not sell or lease property to the General Partners or their
         affiliates; provided that the foregoing shall not apply to the
         proposed merger, sale or other transfer of properties in connection
         with the consolidation as described in the Proxy/Consent Solicitation
         Statement of the Partnership dated [ ]."<PAGE>   1

                                                                  Exhibit 10.25

                                   AMENDMENT
                                       TO
                        AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                   SIERRA PACIFIC INSTITUTIONAL PROPERTIES V

Section 11.2 of the Partnership Agreement is amended to read as follows:

         "11.2 Sales and Leases to the General Partner. The Partnership shall
         not sell or lease property to the General Partner or its Affiliates;
         provided that the foregoing shall not apply to the proposed merger,
         sale or other transfer of properties in connection with the
         consolidation as described in the Proxy/Consent Solicitation Statement
         of the Partnership dated []." Notwithstanding the foregoing, the
         Partnership may enter into leases for office space for no more and 1%
         (and renewals and/or expansions by an existing affiliated tenant for
         no more than an additional 5%) of the rentable space in any real
         property acquired by the Partnership to any Affiliated of the General
         Partner in the normal course of such Affiliate's business on terms and
         conditions and at rentals no less favorable to the Partnership than
         those which would have been determined by arms'-length negotiations
         with a nonaffiliated Person for comparable space in the area where the
         property is located, which determination may be made on the basis of,
         and take into account the terms, conditions and rentals agreed to by
         any other tenants of the property. Notwithstanding the foregoing, in
         the event such Affiliated of the General Partner subleases any such
         space at a lease rate in excess of that paid by such Affiliate to the
         Partnership, such Affiliated shall be required to pay any such excess
         amounts as additional lease payments to the Partnership."<PAGE>   1

                                                                  Exhibit 10.26

                                   AMENDMENT
                                       TO
                        AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                      SIERRA PACIFIC PENSION INVESTORS '84

Section 11.2 of the Partnership Agreement is amended to read as follows:

         "11.2    Sales and Leases to the General Partners. The Partnership
         shall not sell or lease property to the General Partners or their
         Affiliates; provided that the foregoing shall not apply to the
         proposed merger, sale or other transfer of properties in connection
         with the consolidation as described in the Proxy/Consent Solicitation
         Statement of the Partnership dated [ ]."<PAGE>   1

                                                                  Exhibit 10.27

                             AMENDMENT TO AGREEMENT
                             OF LIMITED PARTNERSHIP
                                       OF
                            NOONEY INCOME FUND LTD.

Section 5.2B of the Limited Partnership Agreement is amended to read as
follows:

B.       Without the Consent of the Limited Partners (subject to the provisions
of Section 10.11 hereof), the General Partners shall not have the authority:

         (i)      to sell or otherwise dispose of, at one time, all or
         substantially all of the assets of the Partnership (except for the
         disposition of the Partnership's final Property);

         (ii)     to dissolve the Partnership (except pursuant to Section 2.4
         hereof).

The General Partner shall have the authority to cause the Partnership to merge
with any entity with the Consent of the Limited Partners (subject to the
provisions of Section 10.11 hereof).

         For purposes of this Section 5.2B the term "substantially all" shall
be deemed to mean either (i) sixty-six and two-thirds percent (66 2/3%) or more
in number of the Properties then owned by the Partnership, or (ii) a Property
or Properties representing sixty-six and two-thirds percent (66 2/3%) or more
of the net book value of all of the Partnership's Properties as of the end of
the most recently completed calendar quarter.

Section 5.2D(ii) of the Partnership Agreement is amended to read as follows:

         "(ii)    Acquire or lease any properties from or sell or lease any
         properties to the General Partners or their Affiliates; provided that
         the foregoing shall not apply to the proposed merger, sale or other
         transfer of properties in connection with the consolidation as
         described in the Proxy/Consent Solicitation Statement of the
         Partnership dated [_]."<PAGE>   1
                                                                  Exhibit 10.28

                                   AMENDMENT
                                       TO
                        AGREEMENT OF LIMITED PARTNERSHIP
                                       OF
                        NOONEY INCOME FUND LTD. II, L.P.

Section 5.2B of the Limited Partnership Agreement is amended to read as
follows:

B.       Without the Consent of the Limited Partners (subject to the provisions
of Section 10.11 hereof), the General Partners shall not have the authority:

         (i)      to sell or otherwise dispose of, at one time, all or
         substantially all of the assets of the Partnership (except for the
         disposition of the Partnership's final Property);

         (ii)     to dissolve the Partnership (except pursuant to Section 2.4
         hereof).

The General Partner shall have the authority to cause the Partnership to merge
with any entity with the Consent of the Limited Partners (subject to the
provisions of Section 10.11 hereof).

         For purposes of this Section 5.2B the term "substantially all" shall
be deemed to mean either (i) sixty-six and two-thirds percent (66 2/3%) or more
in number of the Properties then owned by the Partnership, or (ii) a Property
or Properties representing sixty-six and two-thirds percent (66 2/3%) or more
of the net book value of all of the Partnership's Properties as of the end of
the most recently completed calendar quarter.

Section 5.2D(ii) of the Partnership Agreement is amended to read as follows:

         "(ii)    Acquire or lease any properties from or sell or lease any
         properties to the General Partners or their Affiliates; provided that
         the foregoing shall not apply to the proposed merger, sale or other
         transfer of properties in connection with the consolidation as
         described in the Proxy/Consent Solicitation Statement of the
         Partnership dated [ ]."<PAGE>   1

                                                                   Exhibit 10.29

                                   AMENDMENT
                                      TO
                       AGREEMENT OF LIMITED PARTNERSHIP
                                      OF
                   NOONEY REAL PROPERTY INVESTORS TWO, L.P.

Section 5.2B of the Limited Partnership Agreement is amended to read as
follows:

B.       Without the Consent of the Limited Partners (subject to the provisions
of Section 10.11 hereof), the General Partners shall not have the authority:

         (i)      to sell or otherwise dispose of, at one time, all or
         substantially all of the assets of the Partnership (except for the
         disposition of the Partnership's final Property);

         (ii)     to dissolve the Partnership (except pursuant to Section 2.4
         hereof).

The General Partner shall have the authority to cause the Partnership to merge
with any entity with the Consent of the Limited Partners (subject to the
provisions of Section 10.11 hereof).

         For purposes of this Section 5.2B the term "substantially all" shall
be deemed to mean either (i) sixty-six and two-thirds percent (66 2/3%) or more
in number of the Properties then owned by the Partnership, or (ii) a Property
or Properties representing sixty-six and two-thirds percent (66 2/3%) or more
of the net book value of all of the Partnership's Properties as of the end of
the most recently completed calendar quarter.

Section 5.2D(ii) of the Partnership Agreement is amended to read as follows:

         "(ii):   Acquire or lease any properties from or sell or lease any
         properties to the General Partners or their Affiliates; provided that
         the foregoing shall not apply to the proposed merger, sale or other
         transfer of properties in connection with the consolidation as
         described in the Proxy/Consent Solicitation Statement of the
         Partnership dated [ ]."

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