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NEW YORK CITY — Columbia Property Trust is underway on the renovation of 149 Madison Avenue, a 114,000-square-foot office building in Midtown Manhattan’s Nomad neighborhood. The 12-story building was originally constructed in 1916. The redevelopment includes enhanced retail storefronts, windows and lobby, as well as the addition of new amenities such as a multi-purpose lounge and a fitness and wellness center. Gensler is the architect of the project, which is slated for completion by the end of the year.