(w)  stabilize and promote reinvestment by increasing homeownership in neighborhoods that the department has determined to be weak markets.  The director may waive housing production program requirements found to be inconsistent with promoting homeownership in weak markets and take other steps necessary to promote homeownership in the weak market including, but not limited to, reducing the length of time for which housing must be affordable to not less than 10 years and permitting the funded property to be purchased by a household whose income at the time of purchase does not exceed 135 per cent of the area median income, adjusted for family size, or both; but the purchaser must own and occupy the property as the purchaser’s primary residence.  The department shall develop criteria to determine whether a weak market exists, which may include, but need not be limited to, a high concentration of assisted rental housing, a low rate of homeownership, a median household income that is less than the area median household income, low average sales prices, high levels of unpaid property taxes, or vacant or abandoned buildings.