of a qualified rental reduction agreement with respect to a qualified building, tenants in units within such building had been receiving project-based rental assistance under any other Federal program, then, notwithstanding clause (i), the maximum number of units which may be certified as eligible units with respect to the building under subparagraph (A)(iv) shall not be less than the sum of— (I) the maximum number of units in the building previously receiving such assistance at any time before the agreement takes effect, plus (II) the amount determined under clause (i) without taking into account the units described in subclause (I). (4) Eligible tenant (A) In general The term eligible tenant means any individual if the individual's family income does not exceed the greater of— (i) 30 percent of the area median gross income (as determined under section 42(g)(1)), or (ii) the applicable poverty line for a family of the size involved. (B) Treatment of individuals whose incomes rise above limit (i) In general Notwithstanding an increase in the family income of residents of a unit above the income limitation applicable under subparagraph (A), such residents shall continue to be treated as eligible tenants if the family income of such residents initially met such income limitation and such unit continues to be certified as an eligible unit under this section. (ii) No rental reduction for at least 2 years A qualified rental reduction agreement with respect to a qualified building shall provide that if, by reason of an increase in family income described in clause (i), there is no qualified rental reduction amount with respect to the dwelling unit for 2 consecutive years, the taxpayer shall rent the next available unit to an eligible tenant (without regard to whether such unit is an eligible unit under this section). (C) Applicable poverty line The term applicable poverty line means the most recently published poverty line (within the meaning of section 2110(c)(5) of the Social Security Act ( 42 U.S.C. 1397jj(c)(5) ))