i made sure usableintobuildingblock is false
and keep testing it and people can tp home into building block when the owner gets online and wipes tc so people are getting 
inside raided.

my players are experiencing the same issue, except I’ve got usable into and out of building blocked disabled, and players are being they cant tp out or into a building blocked zone when theyre in a base theyve literally just build (not yet placed a tc).

It may be that line 2897 needs to read:

return true;​

This should allow TP in/out of a building where there is no cupboard.

what if they set a home on foundation then someone puts tc down can they still tp into there even though they dont own cupboard?

i had it where a foundation was placed, sethome done, later removed by building owner but the raider was still allowed to TP to the place where they sethome. New TC (Unauthed)/Foundation. Nothing at all was owned by the raider that TP'd back in.