I think it's at least partly a zoning issue, 'cause I've seen it before.
In a small city I'm familiar with, a little-used KH was bought by a local Sikh congregation (who proceeded to refurbish it accordingly), and an older one was also sold to an evangelical church, who turned it into a Christian bookstore...
...whilst the congregation(s) who'd been previously using it built a new KH right next door (admittedly, kinda weird).