Brooklyn Historical Society is one of the few examples of the 19^th century kind of a combined museum and library still in existence. The written piece by me compared three major renovations which were done to the building since it was built. Each renovation done by a different individual consisted of different ideas, proposals and theory.The first renovation done by George B. Post which used terra cotta and red bricks to support the central ceiling of the building and came out to be known as one of the first building to use locally produced terra cotta . Another renovation which took place by Jan Hird associates in 1999-2003 focused more on considering the benefits to its interior to preserve the historical resources. For ex: Installing climate control, renovating the clock tower and replacement of stained glass lay light. A last additional renovation was completed recently by Christoff which consisted of a new classroom with advanced technology, two new gallery spaces and newly built 200 seat auditorium. In conclusion, all three renovations done to the building were made to add more glory and splendor. However, all three renovations differed from each other because every individual has its own unique perspective of approaching to a similar thing.