The binding legal principles established are: (1) Decisions by municipalities to approve building plans constitute administrative action under PAJA as they exercise public power with the capacity to affect legal rights and have direct impact on persons in the area. (2) Owners and lessees of property in the immediate vicinity of a development, within the same use zone, have standing to enforce compliance with town planning schemes as they fall within the class of persons in whose interest the scheme operates. (3) Town planning schemes are hybrid legislative instruments (created by municipal resolution and provincial proclamation) distinct from regulations and by-laws, and therefore not subject to internal appeals under s 9 of the National Building Regulations and Building Standards Act. (4) Where a town planning scheme requires special consent for relaxation of requirements (such as side space), the procedures for obtaining such consent are mandatory and must be complied with. (5) Under s 7(1)(a) of the Building Regulations Act, a municipality must be positively satisfied that building plans comply with all applicable law (including town planning schemes) before approval can be granted; absence of such satisfaction renders approval invalid.