(a) The maximum income limits under § 8-72 shall be eighty per cent of the area median income adjusted for family size.

(b) Notwithstanding the provision of subsection (a) of this section, each developer or housing authority may propose different maximum income limits. In fixing exceptions to maximum income limits under § 8-72, the Commissioner of Housing shall take into consideration (1) the latest average wage as computed by the Labor Commissioner for the city or town served by the authority, (2) the number of vacancies in the projects under the authority’s control, (3) the number of applications for admission to tenancy or for continued occupancy which are refused because of income disqualification, and (4) the latest area median income, as determined by the United States Department of Housing and Urban Development.