With Coldwell Banker Day-Lum Properties, Inc., you get professional Realtors backed by a professional company providing a wealth of experience and enthusiasm. Get to know us, and you'll see that we're a company worth knowing. Day Day-Lum Rentals & Management, Inc., the largest property management company in East Hawaii, provides the best service in Big Island rental properties along the Hamakua Coast and throughout Hilo, Puna and Volcano.