We lived in an apartment when I finally gave up on the all the "gentle" sleep training advice from the experts and decided to let my daughter cry it out. I baked a platter of cookies and left them in the lobby, along with a bowl full of earplugs! There's a driveway's worth of space between the houses on our current street, but I'm quite sure everyone can still hear her occasional screams of indignation. Best of luck, we've got this! 👊🏻