after some thought, heres one from a UW I got a couple of weeks ago;
because most HO's upgrade their housing over time, would comp.2 be equal ? Q-was on a build date adjustment (minor). if their thought process or guidance leads them into different directions, Fair would become a stumbling block; in most of the area's we cover, zoning codes came in during the 1950's or slightly before. Prior to that some building codes came into effect, which I believe entered the arena 1920's, but with old tyme air dried woods & full 2" / 4" etc. lumber, buildings could withstand longer life periods.
Newer construction and engineers came up with the idea of "Tyvec wrap", 6" wall studs and the like. Making housing "air tight" might not be such a great idea, it doesn't allow the building to breath and may cause it to decay from the inside (between the walls) out. It will be a wait N see process.
Green buildings, may also provide questions, but this will also be a wait N see process; I enjoy "new ideas" and efforts to provide better housing, but need to question why those 1800's houses are still standing and most are in great physical condition. Corn cobs & newspaper were the wall insulation factors of this bygone era - winders always needed an improvment (always air leaks). Cast iron radiators, hardwood flooring, and what was known then as "asphalt tile" kitchen floors. Just makes one wonder dunnit.....