San Marcos, TX 78666 (Guadalupe County)
About this property
Luxury Meets Country Living in San Marcos! Welcome to 140 Gustav Ln, a stunning custom-built home offering the perfect blend of upscale finishes, modern technology, and peaceful Texas living. Situated on a spacious 1-acre lot, this beautifully appointed 5-bedroom, 3-bathroom home also features a dedicated office, providing flexibility for it all! Step inside to discover an impressive open-concept layout filled with natural light, soaring 10-foot ceilings, 8-foot doors, designer finishes, and a striking floor-to-ceiling wood-burning fireplace anchoring the expansive living room. The chef-inspired kitchen is the heart of the home, showcasing Level 6 Calacatta quartz countertops, custom soft-close cabinetry, premium stainless steel appliances, smart double ovens, induction cooktop, pot filler, oversized pantry, large center island, and a custom vent hood with designer backsplash. The private primary suite offers a luxurious retreat with tray ceilings and a spa-inspired bath featuring dual vanities, an oversized walk-in shower with dual shower heads, rain shower, bench seating, and a spacious custom walk-in closet. Built with comfort and efficiency in mind, this Energy Star-certified smart home includes spray foam insulation, an 18 SEER two-stage HVAC system, smart home technology package, built-in speakers, security system, pre-wired camera system, water softener, sprinkler system, and backup generator connection. Enjoy seamless indoor-outdoor living with oversized picture windows overlooking the backyard and a covered patio featuring vaulted wood ceilings, built-in speaker zones, and space pre-plumbed for an outdoor kitchen. The fully fenced property offers a 3-car side-entry garage, detached shop/garage with 220V service, seamless gutters, and extensive irrigation. A rare combination of luxury finishes, advanced technology, energy efficiency, and wide-open space, this exceptional property offers what you've been searching for while located near San Marcos!
Property details
Location
About the Area
140 Gustav Ln is located in San Marcos, Texas, in Guadalupe County. Guadalupe County anchors the fast-growing corridor between San Antonio and Austin, centered on Seguin, one of the oldest Anglo settlements in Texas, founded in 1838 and named for Juan Seguín, the Tejano hero of the Texas Revolution. The county blends deep Texas history with explosive modern growth driven by its position between two of America's largest metro economies.
The Guadalupe River flows through the heart of Guadalupe County, providing river frontage properties and water recreation within easy reach of San Antonio. Lake Gonzales and Meadow Lake provide additional water amenities. The terrain transitions from the limestone hills of the western county to the rich blackland prairie soils of the east, which have supported agriculture since the earliest Anglo settlements.
San Marcos had an estimated population of 68,920 as of 2023. The 78666 zip code has a median household income of $55,478, a median home value of $271,900, and a median age of 27. The average household size is 2.35 people.
Guadalupe County is one of the fastest-growing counties in Texas, driven by San Antonio and Austin metro expansion, major manufacturing including the massive Toyota truck plant in nearby San Antonio, and a surging residential real estate market. Seguin's industrial base includes significant advanced manufacturing alongside the growing bedroom community residential sector serving both metro areas.
Demographic data sourced from the U.S. Census Bureau, American Community Survey 5-Year Estimates (2023).
Listing information © 2026 Unlock MLS (ACTRIS). All data provided AS IS. Information is deemed reliable but not guaranteed. Listing courtesy of Marti Realty Group.