Carolyn Carpenter, Broker
Key Cornerstone Realty & Rental Source

2046 Queens Brooke Blvd
St. Peters, MO 63376

Phone: 636.447.8661

Welcome to Key Cornerstone Realty!


Featured Listings


Hello and thank you for visiting! It is our goal, as your full service real estate company, specializing in the Tri-County area, to provide you with superior service at all times. Our local expertise and extensive real estate experience will benefit you whether you are serious about buying or selling a home at this time, or are a returning client checking out the many homeowner resources we can offer.

The Tri-County area includes St. Charles County (City of St. Charles, St Peters, O’Fallon, Lake St. Louis, Wentzville, Dardenne Prairie, Cottleville, Defiance, and Weldon Springs), St. Louis County (There are many cities in this County, some include Chesterfield, Ballwin, Maryland Heights, Creve Coeur, University City, Kirkwood, Florissant, and Hazelwood), and also Lincoln County (Where the City of Troy is).  We also service Jefferson County, Eureka, and Pacific area.

Our Broker and Agents are experts in Real Estate ranging from Residential & Commercial Sales to managing properties for rent.  From helping investors Buy more investment homes & properties, to showing those just starting out how to become a first time home buyer.  Other areas we are certified agents in or have extensive expertise in: buying and selling land, short sales, foreclosures,  HUD homes, and lease purchase contracts. 
Our mission is to  help you with any of your real estate needs by building a relationship that will last a lifetime and gaining your trust as the professionals that we are.