
*Open Houses Tues 6/23 5-7pm, Weds 6/24 5-7pm* The Trailmaster House is a new modern ranch set on 1.5 private acres in Appaloosa Run, one of Southwest Austin’s best-kept secrets. Just outside Avana, Grey Rock, Circle C South, and Meridian, this quiet enclave offers acreage, privacy, and Hill Country surroundings only 3 minutes from SH 45, 6 minutes from MoPac, and 20 minutes from downtown Austin.
Designed to blend striking architecture with livable luxury, the home is filled with natural light and connected to the surrounding landscape.
The main residence includes 4 bedrooms, 3.5 bathrooms, a dedicated office, flex space, and a 3-car garage. An attached private casita offers a bedroom, full bath, kitchenette, and separate entrance—ideal for guests, multigenerational living, a private office or income potential.
Soaring ceilings define the living room and primary suite. A floor-to-ceiling fireplace anchors the main living area, while 10-foot sliding glass doors open to the pool and outdoor entertaining spaces. The kitchen features Italian Calacatta Monet marble countertops, a commercial gas range with double oven, and a butler’s pantry. The sink overlooks a lush interior atrium, creating a rare indoor-outdoor connection. The primary suite feels like a retreat with ceiling height and spa-inspired bath featuring floor-to-ceiling tilework and boutique hotel-style finishes.
The usable lot is surrounded by mature trees and natural landscaping. An existing well offers future potential for irrigation or water use, subject to buyer verification. Outside, enjoy a resort-style pool, outdoor shower, and expansive grounds for relaxing or entertaining. Deer, fox, and other native wildlife are frequent visitors.
Zoned to Baldwin Elementary, Gorzycki Middle School, and Bowie High School, The Trailmaster House offers a rare combination of privacy, acreage, architecture, and convenience—a one-of-a-kind retreat hidden in plain sight.
Property Type
Residential
Year Built
2026
Lot Size
1.50 acres
$/Sq Ft
$706
HOA
$25/mo
Garage
6 spaces
Pool
Yes
Listed by RealTech Realty, LLC
Verified property facts
12104 Trailmaster DR is listed at $2,490,000 with 5 bedrooms, 4 full, 1 half bathrooms, 3,527 square feet, 1.50-acre lot. This places it above the 78737 median of $850,000.
12104 Trailmaster DR is zoned for Austin ISD with assigned schools: Baldwin (elementary), Gorzycki (middle), Bowie (high). School assignments should be verified directly with the district.
12104 Trailmaster DR is a Residential built in 2026 featuring 5 bedrooms, 4 full, 1 half bathrooms, 3,527 square feet, 1.50-acre lot.
12104 Trailmaster DR is presented by the Keenan Group at Compass Real Estate, the #1 Austin Board of Realtors Team (2024) with 1,000+ career transactions and $1B+ in career volume across Austin's luxury market.
The most recent annual property tax for 12104 Trailmaster DR is $5,711. Texas has no state income tax, so property taxes are a primary revenue source. Rates vary by jurisdiction and exemptions. Verify current amounts with the county appraisal district.
#1 Austin Board of Realtors Team. Over 1,000 successful transactions with high-end expertise.
25+ years advising buyers and sellers in this community
Property Details
Features
Appliances
Flooring
Features
Construction
Lot Features
Fencing
Foundation
Patio / Porch
Parking
Waterfront
Listed with current price, original ask, and market time.
Public record data from county appraisal records. Market value can differ from assessed value.
| Year | Taxes | Total Assessment | Land | Additions |
|---|---|---|---|---|
2025-12.0% | — | $519,206 | — | — |
2024+3.6% | — | $589,697 | $300,000 | $216,834 |
2023+42.5% | — | $569,003 | $300,000 | $289,697 |
2022 | — | $399,260 | $300,000 | $269,003 |

Zoned assignments come from the property school fields available to us. District context schools are shown only when an assigned tier is missing. Contact the school district directly to verify current boundaries and enrollment eligibility. Ratings from GreatSchools.org.
20% ($498K)
$2,490,000
Luxury property intelligence
A sourced read on Appaloosa Run pricing, timing, and property scale. No automated valuation claim.
List price
$2,490,000
Price per sqft
$706/sqft
Vs. Appaloosa Run median
Not available
Days on market
20 days
Original to current
No verified reduction
$2.5M original
Active inventory context
Ask for current inventory
Source: MLS Grid / Unlock MLS and Keenan Group review as of Jun 22, 2026.
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#1 ABOR Team 2024 with $1B+ career sales volume
With 20% down ($498,000) on a 30-year fixed mortgage at approximately 6.75%, the estimated monthly payment for 12104 Trailmaster DR is around $13,396 including principal, interest, and estimated taxes. Actual payment varies by rate, down payment, insurance, and HOA fees.
At $2,490,000, 12104 Trailmaster DR is in the Appaloosa Run market where there are currently 81 active listings in 78737. The Keenan Group has completed 15 transactions in 78737 as part of 1,000+ career sales totaling $1B+ across Austin.
12104 Trailmaster DR includes verified waterfront access: None. Buyers should confirm shoreline, dock rights, and floodplain status during due diligence.
12104 Trailmaster DR sits on a 1.50-acre lot, providing substantial outdoor living space. Properties of this scale in Austin's luxury market typically feature pool areas, outdoor kitchens, and mature landscaping. Confirm specific amenities with the listing agent.
12104 Trailmaster DR is part of a managed community with HOA dues of $25 annually. HOA-managed communities in Austin's luxury market typically provide amenities such as common areas, security, and exterior maintenance. Verify current dues and rules with the HOA directly.
Answers use visible listing facts, school context, and neighborhood data available on this page. Verify time-sensitive details before making decisions.
Car-Dependent
N/A
Somewhat Bikeable
Walk Score measures walkability based on distance to amenities. Transit Score measures public transportation access. Bike Score measures bikeability based on bike infrastructure and terrain.
8 events on record
Current Price
$2,490,000
Timeline data compiled from MLS records and public records. Information deemed reliable but not guaranteed.
| Year | Taxes | Total Assessment | Land | Additions |
|---|---|---|---|---|
2025-12.0% | — | $519,206 | — | — |
2024+3.6% | — | $589,697 | $300,000 | $216,834 |
2023+42.5% | — | $569,003 | $300,000 | $289,697 |
2022 | — | $399,260 | $300,000 | $269,003 |
Timeline merges MLS activity (when permitted) with public records. Some details may be restricted to registered VOW clients.
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