Demolition means the removal by razing or other means, in whole or in part, of one or more permanent buildings of a public housing development. A demolition involves any four or more of the following:
(1) Envelope removal (roof, windows, exterior walls);
(2) Kitchen removal;
(3) Bathroom removal;
(4) Electrical system removal (unit service panels and distribution circuits); or
(5) Plumbing system removal (e.g., either the hot water heater or distribution piping in the unit, or both).