116 East 91st Street is a rare free market 4 unit brownstone apartment building built in 1920. Located on a quintessential Carnegie Hill block, it is 20 feet wide by 68 feet deep on a 100 foot lot with 6 stories. The four units of this property are all renovated. The units are separately metered with individual boilers and hot water heaters, and feature beautiful architectural detail, in home wash...