This project includes several model cfg files. One represents a
mid-1960s state of the facade with somewhat diversified casual
gains while a variant includes stocastic population derived
casual gains.

A second pair of models takes into account the building after
a number of refurbishements to glazing, frames and the addition
of 50mm of PIR insulation to much of the facade.  Again there
are two variants, one with scheduled casual gains and one with
stocastic casual gains.

