What can I possibly do with my old dog? :(?

My parents moved to an apartment that they are renting and they told us we couldn't have pets in the apartment. So when they moved, I offered to take care of our family dog at my work's live-in space. My dog is is now 13 years old. I was able to take care of her well for a year and then my workload piled up so much that all the time I could spend with the dog was during breaks when I rushed to take her outside for quick bathroom breaks.

Now, the other people sharing the building with me were complaining that I had a dog (the big part of the building is a commercial building) and I am no longer able to keep my dog with me there. My parents are secretly keeping the dog at their apartment now, but everyone is stressed out because of my dog.

We all really love our dog but there is no legal way to keep her now. What can I possibly do with me dog?

I'm scared of putting her up for adoption because of her age and she also developed this skin condition so I don't think if anyone would want her.

UGH What do I do!?!?!?