Inaugural Member Nobody knows homes better! Sine and Monaghan/GMAC Real Estate has been providing real estate services in Wayne, Macomb, and Oakland counties since 1933. Our team of experienced sales professionals is available to help you buy or sell any home in the area. We're here to provide you with current real estate information and to share with you the latest housing trends. As a company, we're committed to providing real estate services beyond expectation. We also consider it our privilege to help make this a better place to live. And we are actively involved in community organizations.