(2) HUD may permit a flat rent of no less than 80 percent of an applicable small area FMR (SAFMR) or unadjusted rent, if applicable, as determined by HUD, or any successor determination, that more accurately reflects local market conditions and is based on an applicable market area that is geographically smaller than the applicable market area used in paragraph (b)(1) of this section. If HUD has not determined an applicable SAFMR or unadjusted rent, the PHA must rely on the applicable FMR under paragraph (b)(1) or may apply for an exception flat rent under paragraph (b)(3).