I lived in a two family house in Brooklyn, NY. My landlord sold the house a
Few months ago.

There is a site (but I can't remember the name of it) that lists the names
of people who lived at whatever address I put in within the five boroughs
In NYC.

In case you're wondering... I now live very far from there to go in person
I was caring for a feral community of cats and wanted to talk to the
people about it.

Send a snail mail to your old address, to whom it may concern, or access the public property records on the net.