It wasn't stealing so much as it was --- robin hooding. The places behind the doors had things, and in Starklandia they didn't. So they took them to live -- and in some cases thrive. It was as simple as that.
Heck, sometimes they even paid. When money was a direct possibility, anyway.
It was probably good she knocked twice, and louder the second time. It got Lucky barking and then Tony the Evil Goat making noises which got Clint's attention. So he made his way downstairs from the actual Apartment to what was now the defunct bit that had used to be the living room before whole ass buildings started appearing inside other ones.
Anyway. Tony lived there now, so there was no reclaiming it.
"Kate!" He said as soon as he opened the door. "Is that cof--hey! Tony! No!" He shoved a goat head out of his way and gave Kate an apologetic expression. "Wanna --come up?"