I'm not sure what it is you are asking - You are moving from the Upper East Side to the Upper West Side and you want to know if you should be worried. You categorized yourself as a homebuyer, so if you've already purchased what you are moving to, I would assume you are not moving without having done lots of looking first. What is it you want to know if you should be worried about? I can tell you that this is one of the most in-demand neighborhoods, and inventory is therefore not abundant, so good for you that you snagged something there. Worried about what?