An eligible person on behalf of whom assistance is provided under this subpart shall select the unit in which such person will live using rental assistance under this subpart; except that where necessary to assure that the provision of supportive services to persons is feasible, a recipient may require that a person participating in the program live
(1)
in a particular structure or unit for up to the first year of participation, and
(2)
within a particular geographic area for the full period of participation or the period remaining after the period referred to in paragraph (1).
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