Brooklyn Borough Hall in Downtown Brooklyn was originally Brooklyn City Hall. Construction began in 1834 and “Brooklyn’s new City Hall opened its doors in the spring of 1849, although the building really wasn’t completed until the end of the 1860s.” After Brooklyn was incorporated into New York City in 1898, City Hall became Borough Hall. According to a history article, there was a movement to demolish Borough Hall in the 1920s. The land for the former City Hall had been given to Brooklyn by Hezekiah Pierrepont (Brooklyn Heights still has a Pierrepont Street). Pierrepont added a provision to ensure that the land would be used for its intended purpose, I quote from Brownstoner:
The deeds and old records were dusted off, and it was revealed that Hezekiah Pierrepont was a crafty planner. The deed to the triangular property, which included both the building and the small park in front of it, had conditions attached to the gifted land. Pierrepont stipulated that no matter what the city wanted to do, no building other than a city hall could be erected on the site. If they violated that, the land could revert to the Pierrepont estate. Borough Hall was there to stay.
I tip my hat to Pierrepont for the good planning. While recent Borough Presidents have had an unfortunate tendency of making Borough Hall tacky with their de facto campaign banners, it is a nice building and monument to Brooklyn’s history. Now if only we could raise the Soviet-style Kings County Supreme Court building which casts a shadow over the whole plaza.