As Brooklyn grows fast, and changes shape, especially horizontally, the requirement of place to live which is affordable, easy, and quick to construct is tangible. The project considered as modular apartment project which meets the mentioned requirements. The site is seen at the intersection of Classon and Willoughby Avenue in Brooklyn. In this topic in addition to designing of the building, other factors such as constructional aspects, HVAC systems, structural, environmental analysis and fire codes are considered. The concept of the design is to consider modules in a way that their different formations shape different square footage as well as being structural.