About Us

Castle Hill Investments has been the leading Central Texas duplex, fourplex, and single family brokerage firm in terms of volume since it’s founding in 2004.

Every year since 2005, broker/owner Robert Grunnah has received numerous awards for Top Sales in the community including #1 out of over 10,000 agents in 2006 and in the top 5 for five years running. With over 1300 transactions, the company is approaching $250,000,000 in sales volume.

In addition to being a prominent voice for local and national newspapers and magazines about investments, Robert also owns over 150 units in his own portfolio, giving him a unique perspective on the 1-4 unit investment property market. Only a Realtor that has experience buying and selling their own investment properties can best understand the needs of other buyers and sellers.

Jeff Lowther is recognized as the preeminent buyer representative for investment property in the community.  As a team, Robert and Jeff offer vast experience and an unparalleled perspective on the market to property owners, investors, and owner-occupant duplex buyers.

Our Team

ROBERT GRUNNAH

Broker/Owner

A native Texan, Robert began his career in the Internet and Software industries. Realizing that the only way to truly take control of his financial future, he purchased his first investment property in 1998. Recognizing a lack of investment-specific expertise in the industry, he founded Castle Hill Investments in 2004 to share the lessons he had learned with other investors. In less than seven years, he owns one of the largest portfolios of 2-4 unit properties in Austin, and consistently wins 'Top Producer' awards for his unparalleled sales volume. Robert holds a BBA and MBA in Finance from the University of Texas at Austin and enjoys travel, independent film, and living in the greatest city in the World.

JEFF LOWTHER

Director of Buyer Services

Jeff has been actively involved in the Austin real estate community for twenty years.  He obtained his real estate license in 1992 and his broker’s license in 2005. Jeff purchased his first property (a duplex) in 1996 in south central Austin and decided to renovate it and live in one unit and rent out the other unit.  He instantly became focused on the investment property niche and the many benefits of investing in real estate.  He has since purchased many other investment properties for his own portfolio, and specializes in assisting other investors in identifying and acquiring investment properties in the Austin area.  Jeff has a B.S. in Communications from the University of Texas at Austin and an MBA with a concentration in finance from Rice University in Houston.  He is happily married to his wife Marcy and they have two wonderful sons, Luke and Kyle.

ADRIENNE LAOSA

Director of Client Services

Born and raised in the Lone Star state and the youngest of five children, Adrienne brings a motivated, friendly, and intelligent focus to the Castle Hill team. After graduating from St. Michael’s Academy in Westlake and attending Baylor University for 2 years, she found her way back home to Austin where her high-achieving personal career goals continue to flourish. Adrienne loves entertaining friends and co-workers, listening to any type of live music around, and loves fishing, dogs and camping in West Texas.

JUSTIN DONJUAN

Assistant Client Services Director

Justin was raised in Austin, and is the youngest of three. Justin joined Castle Hill Investments to explore his interest in the real estate field.  Justin contributes an excellent work ethic, a "get it done" mentality, and a positive energy that is infectious within the company. Justin is a family man who loves to spend time with his wife and beautiful infant daughter.

TRAVIS & ABBY 

Directors of Security

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