The door was not locked and even though when I hovered over him it said "adoption agent:, when I clicked on him there was no option for adoption or to end the inspection. When I went out to manage worlds and reloaded, the cats where there for a minute but then faded out like they left. I had to travel to another lot to end the adoption event.
I ended up hunting down three strays(strays don't spawn a lot when you just visit a place) and befriending them to adopt. I don't recommend this, it takes forever as my sim would just stand there and do nothing while the stray roamed around. Once I could actually get him to do an introduction I was able to adopt them pretty quick.