There were not many KHs in the pre-75 era, at least not in Europe. Our congregation owned its own old house, and was one of the first to have one. So it was a question of renting larger school rooms or space like that. Post-75 just saw slightly less people coming but no selling necessary. My first congregation donated thousands of dollars monthly to the branch because of low cost of renting a room in an old building.
Two neighnouring congregation are a bit anxious right now, as each of them sold their KH last year in order to build new ones and now are having their meetings in the KHs off other congregations. Each of them have a bank account of some 1 million dollars because of the sales.
My congregation? Would have been debt free in 40 years (no kidding), but it is now zeroed out. Two opposite takes.