CENTURY 21 Semiao & Associates has the power to help you buy or sell your home as part of the largest residential real estate sales organization in the world with approximately 13,000 independently owned and operated franchised broker offices in 84 countries and territories worldwide and more than 146,000 independent sales professionals. That means CENTURY 21 Semiao & Associates has the power to help you move across town, across the country or around the world. The CENTURY 21® System offers you and your family real estate assistance in marketing your current property as well as helping you settle in your new location as conveniently and quickly as possible. .