There is no 'average'. There are many averages. You can group all the apartments that are available to rent on a street, in a building, by the number of bedrooms, if the apartments come with a doorman, if they have a view and other factors. Some care about parking while others want to be close to a subway entrance. Some things are really critical to people. If someone wants to be in the Upper Eastside they will only look at apartments that fit a geographic profile. People who need 3 bedroom really do not consider the price for the average 1 bedroom. Depending on what you want to learn you can slice and dice the search to produce an average that has meaning. You do need to narrow the criteria.