(a) An architectural plan or specification for the construction of any new building or for the modification of any existing building intended for use as an institutional residential facility shall be prepared by an Architect, under the Supervision and Control of an Architect, or by an engineer pursuant to §1.210(c) or (e) of this title (relating to Architectural Plans and Specifications), regardless of:(1) the number of stories or square footage of the building; and(2) whether the building is privately or publicly owned.(b) For purposes of this section, "institutional residential facility" means a building intended for occupancy on a 24-hour basis by persons who are receiving custodial care from the proprietor or operator of the building.