Cornerstone Mgmt Systems Inc.

Cornerstone Mgmt Systems Inc. is a mixed-profile corporate owner. Across their buildings, tenants rate them 3.6/5 across 20 reviews, with 80% recommending their buildings and 63% approving of them as an owner or associate. Their portfolio records 6 evictions, 91 open violations, and 17 litigation cases. Data last updated August 7, 2026. Associated with 103 buildings and 1,258 units across Manhattan and Brooklyn, Cornerstone Mgmt Systems INC. is a corporate owner responsible for a portfolio that spans construction eras from the 1830s to the 2000s, reflecting multiple generations of development. The portfolio spans multiple neighborhoods across Manhattan, including Tribeca, West Village, Chelsea, East Village, Hudson Square, West Chelsea, Kips Bay, and Gramercy Park. The buildings are primarily mid-rise. About 15 percent of the associated buildings have rent-stabilized apartments. Prospective renters can find building-level ratings, reviews, and open-data records on the associated building pages.