McGrath Realty Inc McGrath Realty Inc. is the Hudson Valley's premier Commercial and Residential Brokerage firm, specializing in traditional sales and leasing of Homes, Condos,office, retail, commercial, industrial and land development properties. Our putnam county commercial realtor marketing specialists are able to utilize the right channel to acquire, publicize and sell properties in the quickest and most efficient ways possible. This helps us provide you with knowledge regarding current or future infrastructure, the nature of deals made and who the most influential people are in the process.