Help me looking for a fanfic about Harry Styles that I read many years ago and I don't know the name. It's about neighbors

It was called something like the neighbor from 2ºB or 1ºB (I don't remember 😢) The story is about a young girl who moved into an apartment on her own and her neighbor was Harry but he wasn't famous it was just his name. They didn't get along but she becomes friends with his best friend without knowing they were friends and in the end Harry and she get together. The friend was a lawyer or something like that and had a daughter and I think it was Liam. Please I need to know its name