No action attacking or otherwise questioning a contract of financial assistance for, or the acquisition, construction or development of, a low-rent housing project for which final approval or a legally binding commitment was given by the governing body of a state public body or local public entity prior to August 20, 1976, may be brought on the grounds of failure to obtain referendum approval pursuant to Article XXXIV of the State Constitution, except as to low-rent housing projects owned in fee by local housing authorities pursuant to the Housing Authorities Law, Chapter 1 (commencing with Section 34200) of Part 2, and farm labor centers developed after January 14, 1972, pursuant to the Farm Labor Centers Law, Part 7 (commencing with Section 36050) of this division.