Here in USA. Oldest churches are from the 4th century elsewhere.

For the record: I don't think that priests should be able to buy $50M jets or keep 40% of total land of x country tax free, but they should not be forced to sell buildings because property tax is too high.

Yes. My comment was about "here in the USA" because the grandparent comment talked about churches existing "before Boston".

Churches are routinely handed over to the state or to commercial entities in order to preserve them because church membership is in rapid decline and its very expensive to take care of the church building especially if it has "survived millennia".

edit: got it wrong as per below comment

I assume they meant "here in USA" with regard to the comment about 300 years, but are pointing out that outside the US there exist churches as old as 4th century.