From the Ground Up
Commercial renovation in high-rent neighborhood poses unique design and construction challenges

Construction challenges are inherent in a renovation project that requires lowering the cellar of a 10-story occupied apartment building dating to 1912. And working in a narrow lot edged on three sides by retail and corporate neighbors in prime New York City real estate can be counted on to provide plenty of added complications for designers and contractors alike. Factor in the inevitable surprises that surface only during demolition of existing structures, and things really start to get interesting.

The $1.7 million renovation became a de facto design-build project for its development team, which conceived the project to enhance the value of the property. Cooper Square Realty, the New York City-based owner, wanted new commercial space at the ground level, but like most urban properties, the building was subject to zoning limits on total apartments, square footage and height.

To meet the owner's goal, a bold design by architect Montroy Andersen Design Group and structural engineer Wexler & Associates, both of New York City, called for combining three ground floor apartments and half of the cellar. The renovation, managed by IDI Construction Company, would create a space suitable for an upscale boutique or restaurant, with the added bonus of allowing a future penthouse, thanks to additional zoned apartment space made available by the conversion....