Sec. 8122A. Disposal of real property
(a) AUTHORITY TO DISPOSE OF REAL PROPERTY- To the extent provided in advance in appropriations Acts, the Secretary may dispose of real property of the Department, including land and structures and equipment associated with such property, that is under the jurisdiction or control of the Secretary by--


(1) transfer to or exchange with another department or agency of the Federal Government;

(2) conveyance to or exchange with a State or a political subdivision of a State, an Indian tribe, or another public entity; or

(3) conveyance to or exchange with any private person or entity

http://thomas.loc.gov/cgi-bin/cpquery/?&sid=cp108xPuQA&refer...

The Service has authority to dispose of real property having a value of $15000 or less.

http://www.fws.gov/policy/342fw5.html

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Note added at 2 hrs (2009-06-09 16:44:25 GMT)
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Or "real estate":

The MTA has broad authority to dispose of real estate. “whenever it determines that it is in the interest of the authority” to do so.

https://nycourts.gov/press/MSG v MTA.6-05.pdf

This will gives his executors authority to dispose of real estate for the benefit of his children living in Newport, (P. C. 6-47.)

http://www.archive.org/stream/bulletinofnewpor09newp/bulleti...