About Us

The Blankenships first moved to the Highland Lakes in 1983 and built their family’s home on the shores of beautiful Lake Buchanan. Their tremendous knowledge of this area comes from twenty-two years of community involvement and enjoyment of the beautiful hill country and the Highland Lakes. Through these past twenty-two years, Joan and her husband, Mark, have been heavily involved in the local real estate market both for their customers and for their own companies. In fact, they have a long history of Real Estate Sales and Property Management in the Highland Lakes area. Mark and Joan Blankenship created TJM Properties, LP and TJM Investments, LP in order to acquire residential, commercial and self-storage rental property of their own. Years of searching, evaluating, negotiating, developing, re-zoning, financing and managing their own properties has armed them with invaluable knowledge about the real estate market in the Highland Lakes. In addition, their extensive community involvement gives them insights into what is happening in the local communities and whom you need to go to in order to get things done. The same professional service provided by TJM Properties and TJM Investments is now available to other investors through our real estate company, TJM Realty Group.

Joan Blankenship, President, Broker, Co-owner and Realtor, is a 1974 graduate of Texas State University and holds a Masters from the University of Texas at San Antonio. Joan has over 30 years of experience as an administrator and teacher in Texas public schools. She currently holds a seat on the Board of the Hill Country Humane Society. Joan’s professional affiliations include the National Association of Realtors, the Texas Association of Realtors and the Highland Lakes Association of Realtors.

Mark Blankenship, Co-owner and Vice President, is a 1974 graduate of Texas State University, and has 25 years of experience in senior management in the Retailing industry. He is a past President of the Board of the Lake Buchanan / Inks Lake Chamber of Commerce. He has served as a member of the Board of the Hill Country Economic Development Committee and as a member of the LCRA’s Lake Buchanan Advisory Board.

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Maintenance Request
Rental Application
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