Cornerstone Management Systems is a privately held property management company founded in 1978. The firm specializes in managing small to mid-sized residential properties throughout Manhattan, offering a comprehensive range of services that include financial oversight, maintenance coordination, and tenant relations. Its portfolio primarily consists of cooperative and condominium buildings, where it provides tailored solutions to meet the operational and administrative needs of each property. The company emphasizes efficient building operations, compliance with regulatory requirements, and transparent financial reporting for boards and owners. With decades of experience in the New York City real estate market, Cornerstone Management Systems has established itself as a trusted partner for property owners seeking professional management services.