Dallas Mansion Hits the Market for $25 Million

Another $25 million listing hit the market in Texas this week.

Dallas entrepreneurs Melbourne and Jamie O’Banion listed their mansion at 4815 Saint Johns Drive in Highland Park on Tuesday for $24.9 million, public records show. Allie Beth Allman, founder of the leading Dallas luxury brokerage Allie Beth Allman & Associates, has the listing.

Built in 2020, the six-bedroom, eight-bathroom home spans 11,433 square feet on a 0.6-acre lot. The listing price amounts to about $2,200 per square foot.

Melbourne O’Banion is the CEO of Dallas-based Bestow, a software startup for life insurance carriers. Jamie O’Banion is the founder of Dallas-based cosmetics company BeautyBio.

The O’Banions’ mansion follows a few early spring and late winter listings clustering near the top of Texas’ residential market.

Another Allie Beth Allman & Associates agent, Susie Thompson, is representing luxury builder Hadley & Bess for a spec home at 10010 Strait Lane, asking $25 million. Texas’ most expensive new listing in February was a $25.5 million spec mansion at 4 West Lane in Houston.

These homes are among the most expensive on the public market in Texas.

Aside from those 2026 listings, only a few homes in Texas outrank the O’Banions’ for asking price, and most are in Dallas: the Cox Family’s Crespi Estate, a $64 million listing at 5619 Walnut Hill Lane in Dallas, which dominated March listings in 2025 and remains the most expensive home available in Texas; Colleen Romanov’s Lodge at Hunters Creek, a castle at 107 Timberwilde Lane in Houston, now asking $49.9 million; Blantyre Homes’ spec mansion at 4400 Belfort Avenue in Highland Park, asking $34.5 million; Larry Lacerte’s home at 3711 Lexington in Highland Park, asking $29.9 million; and Cary Maguire’s estate at 4606 Park Lane in Dallas, asking $27 million. Three of these five homes have cut their asking price.