Unique opportunity to combine 50 East 81st Street and 52 East 81st Street and create a 40-foot wide mansion in one of the most desirable residential neighborhoods on the Upper Eastside.With approximately 13,141 square feet of living space, these existing townhouses lend themselves to a multitude of possibilities, including an upgrade and restoration for use as a magnificent single-family home, creation of an owner's duplex or triplex while positioning other units for lease, or for the use by an institution. With additional FAR and the absence of a landmark designation, the potential to upgrade or redevelop is practically limitless.Wonderfully located on the south side of picturesque and tree-lined 81st Street, the buildings sit mid-block between Madison and Park Avenues. Central Park and the Metropolitan Museum of Art are around the corner, putting these properties squarely amidst the best culture, recreation, dining, and retail offered anywhere in Manhattan.About 50 East 81st Street:Currently configured with a physician's office at grade, plus two residential apartments on each of the next four floors. Estimated at 1,700 square feet the office can be accessed either from the main building or through a separate side entrance. It is also connected to a charming, south-facing garden. All eight of the residential units have high ceilings, period details, ornate mantelpieces, and oversized windows. Six of the eight can be delivered vacant. Rent stabilized tenants occupy the remaining two. Beautiful sight lines to the south face capture other townhouses. This property also has a full cellar level with attractive ceiling height and a partially poured concrete floor. In addition, there is a full set of stairs connecting the fifth floor and a large, flat roof.About 52 East 81st Street52 East 81st Street is a grand 20-foot wide, 5-story townhome with stunning proportions and exquisite architectural detail throughout its gracious approximately 5,776 square feet of living space. It features a deep, lushly planted south garden and serene terrace. Currently configured as three units (two duplex apartments and one floor-through), 52 East 81st Street may be delivered vacant, affording the rare opportunity for a discerning buyer to create a custom single-family dream home in an unrivaled Upper East Side location, or benefit from the income of a multi-family property.