Century 21 Gelineau & Associates is on Main Street at the intersection of Lyman Street. It has been in business for more than 35 years. Century 21 Gelineau & Associates is a full-service real estate agency. Its large staff of experienced agents is ready to assist you with your real estate related needs. It can assist you in finding a home to purchase in Waltham or many surrounding communities. It also can help you in selling a home, finding a mortgage, renting an apartment and more.