Corey Gluckstal, an entrepreneur with experience in real estate and a former corporate executive, has joined Long Island's newest commercial real estate brokerage, Sperry Van Ness Commercial Real Estate Advisors, in Holbrook, as an investment sales advisor. Gluckstal said he plans to use his network of business contacts to capitalize on his investment, entrepreneurial and financial expertise in the investment sales area with a focus on multifamily and single-tenant credit net-lease properties ranging from $1 to $25 million. "Corey Guckstal is a valuable addition to the Sperry Van Ness team and we expect him to play an important role as we develop our investment sales business," said David Madigan, president of Sperry Van Ness.