Servicing Dutchess, Putnam and Westchester Counties for Residential, Commercial and New Construction. At Keller Williams Realty, they believe in building careers worth having, businesses worth owning, and lives worth living. Their agents are more successful because of the resources that Keller Williams provides and business models that they were founded on. Keller Williams has completely revolutionized the industry, through extensive training, industry-leading technology, a coaching model, their profit-sharing, and their agent-focused approach to their business.