Cornerstone Management Systems Inc

Cornerstone Management Systems Inc is a modestly rated but responsible corporate owner. Across their buildings, tenants rate them 3.8/5 across 8 reviews, with 38% recommending their buildings and 38% approving of them as an owner or associate. Their portfolio records 2 evictions, 7 open violations, and 2 litigation cases. Data last updated September 4, 2026. Across the Upper West Side, Lenox Hill, West Village, Murray Hill, Tribeca, Chelsea, and Hell's Kitchen in Manhattan, Cornerstone Management Systems INC is a corporate owner associated with 12 buildings and 146 units. The portfolio spans multiple neighborhoods across Manhattan. The buildings were constructed between 1861 and 1940 and are primarily mid-rise. About a quarter of the associated buildings have rent-stabilized apartments. Individual building ratings, tenant reviews, and public records are on the associated building pages.