I believe it was on Ao3. It was a Post-Winter soldier fic where Bucky was watching Steve and (Sam?)Mostly from afar. I think he was beginning to heal from the years of abuse he experienced as the Winter Soldier. I remember he was hunkered down in an apartment and knew his neighbors while also devoted time to recon and getting his bearings back. I remember it was a longer fic.
If anyone can point me in the right direction so I can continue the search it would be SO helpful, thank you