Urban areas are typically associated with high noise levels. With a population of more than eight million and growing, New York City is one of the largest cities in the world. In New York City, because of the population density and the wide variety of land uses (ex: residential, commercial, transportation, manufacturing and industrial) that exist in close proximity, it is common for a residential building to be located in an area with ambient noise levels that would be considered unsuitable for residential use. To protect inhabitants of a planned building to be located in an area with high ambient noise levels, an (E) designation or a Restrictive Declaration may be used to ensure that the building's interior environment meets a certain acoustical design criterion. In this paper, the (E) designation is defined, its regulatory process is outlined, the acoustical design criterion is discussed, and examples of common mistakes for noise (E) designation projects are listed.