NEW YORK CITY — Greystar Real Estate Partners LLC has acquired 800 Sixth Avenue, a 266-unit multifamily community located in the NoMad neighborhood of Manhattan. Completed in 2003, the property offers quick access to major employment centers like Silicon Alley, which houses the offices of Google, Facebook, Twitter and IBM. The development is also in close proximity to Grand Central Station, the Hudson Yards mixed-use development and the World Trade Center. Greystar will implement a capital improvements program that centers on upgrading appliances, cabinetry, lighting, plumbing and hardware fixtures within the units. The new ownership will also overhaul the property’s amenity spaces, which include a fitness center, sky deck and a resident lounge with a chef’s kitchen and billiards room. The seller was not disclosed.