The first eleven commissioners to take office under the Landmarks Law were sworn in during June 1965. Platt was the first chairman, serving until 1968. The LPC's first public hearing occurred in September 1965, and the first twenty landmarks were designated the next month. The Wyckoff House in Brooklyn was the first landmark numerically, and was designated simultaneously with structures such as the Astor Library, the Brooklyn Navy Yard's Commandant's House, the Bowling Green U.S. Custom House, and six buildings at Sailors' Snug Harbor. The first landmark district, the Brooklyn Heights Historic District, was designated in November 1965. Within its first year, the LPC designated 37 landmarks in addition to the Brooklyn Heights Historic District. The LPC's earliest landmarks were mainly selected based on their architecture, and were largely either government buildings, institutions, or structures whose preservation was unlikely to be controversial. As a result, several prominent buildings were destroyed in the first several years of the LPC's existence, such as the Singer Building and the New York Tribune Building. Other structures, such as the Villard Houses and Squadron A Armory, were saved only partially.