Glenstar Properties (Zisook Family) is a Chicago-based family office and real estate investment platform focused on direct value-add real estate opportunities across the United States, with Midwest relevance and stated activity in Chicago and Dallas office markets. The firm invests in, develops and operates office, logistics and mixed-use multifamily properties through a vertically integrated approach spanning acquisition, development, asset management, property management and leasing. It is most relevant for sponsors or operators seeking real estate capital rather than venture financing.