Thanks for these very interesting stories!
There is a nearby Luthern church & synagogue that share space, as in below the big sign outside that says "<Name of church> & the changeable message board has a smaller hang tag below it, "Home of <Name of Jewish Congregation> so this appears to be a permanent arrangement. Ironically, it’s about 200 yards from a separate synagogue.
We rent space to a Hindu school on Sunday afternoon when our building would otherwise be closed up.
“Two Jews, three opinions.”
My mother’s parish is part of what used to be a Capuchin minor seminar (they got up to diaconate, then moved to the major seminar; not sure if those are the right terms in English). The church itself isn’t too big but the attached meeting rooms are large, there is a huge yard, and the old dorms and kitchens are still usable.
Different parts of the building can be rented for nominal fees; the Pastor can choose to waive them. I know that some previous renters include the local Iglesia Evangélica (Roma, do not confuse with US-style evangelicals; combo of a Black-church style of worship with a lot of Catholic imagery) and two different Protestant denominations catering to African immigrants. Usually they rent the meeting zone or the yard, but on occasion it’s been the church. Sometimes when one of them was renting the meeting areas regularly, part of the Easter services have merged.
In my home town, a local Reform Jewish congregation uses the building of a Presbyterian church for their services. Since the Jewish services are Friday and Saturday, and the Presbyterian ones on Sunday, there’s generally no conflict.
Also a Universalist church is currently holding services in an Episcopal Church nearby.
In small towns, the members of the churches often know each other and are willing to help each other.