Founded 101 years ago by Baltimore industrial wealth, transformed by Alfred G. Vanderbilt Jr. into a Thoroughbred racing and breeding dynasty, and later restored by Under Armour founder Kevin Plank, who reportedly invested more than $22 million in the land and facilities, the 524-acre estate sits at the heart of Maryland horse country.

Off-market? Maybe. Unreportable? Absolutely not. This 25-foot-wide Upper East Side townhouse is pure architectural drama—with colonial bones and a century of very cool secrets.

The Lindens was built in 1910 for Max Fleischmann, heir to the Fleischmann's Yeast fortune. One of the largest opponents of the Prohibition, the renowned bootlegger is said to have inspired F. Scott Fitzgerald’s Gatsby character.