WELCOME TO ONE DEERFIELD New. Vibrant. Luxurious. One Deerfield Apartments offers a premier living experience in Ohio’s Deerfield Township (Mason area). Built to inspire, our community welcomes you to an oasis of indulgence where stellar customer service melds with high-end amenities for your utmost enjoyment. From exciting social spaces to easy access to everything your heart desires, our apartments in Mason, OH, deliver the very finest apartment living experience and are conveniently located near West Chester, Blue Ash and Montgomery. One Deerfield features unique amenities such as a wine and beer garden, co-working hub, gaming lawn, and outdoor workspace, along with.