Ouch! I can see how that would be a serious trigger for you.

I get grumpy just driving through the suburb where my Bad Group used to be.

I went to the place where my Good Group used to meet and I cried because it was standing empty and unloved.

FANTASY:

Since it's right next door, maybe you and your T could stand together outside the front gate and you could point and say, "There! That's where it happened."

Not much, I know, but sometimes having T go the extra mile can be very healing.