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#1 Austin Board of Realtors Team 2024#1 Austin Board of Realtors Team 2024Loading
Verified property facts
21100 Santa Carlo Ave is zoned for Lago Vista ISD with assigned schools: Lago Vista (6/10) (elementary), Lago Vista (6/10) (middle), Lago Vista (6/10) (high). School assignments should be verified directly with the district.
21100 Santa Carlo Ave 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 21100 Santa Carlo Ave is $1,042. 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.
With 20% down ($5,000) on a 30-year fixed mortgage at approximately 6.75%, the estimated monthly payment for 21100 Santa Carlo Ave is around $217 including principal, interest, and estimated taxes. Actual payment varies by rate, down payment, insurance, and HOA fees.
#1 Austin Board of Realtors Team. Over 1,000 successful transactions with high-end expertise.
25+ years advising buyers and sellers in this community
Listing timeline with current price, original ask, and market time.
Discover the perfect canvas for your custom dream home at 21100 Santa Carlo Avenue in Lago Vista! This gently sloping 0.36-acre lot is nestled just 1,260 feet from the sparkling waters of Lake Travis (when at full pool) and a quick 5-minute golf cart ride (2 miles) from the Lago Vista Golf Course clubhouse. Imagine enjoying panoramic lake views and breathtaking sunsets from a thoughtfully designed, modern build—especially if you include a rooftop deck.
While most of the lot sits in the 500-year floodplain, and approximately 30% in the 100-year floodplain toward the back, this unique location offers a tranquil hillside setting and a rare blend of close water access and scenic vistas. Take advantage of the convenience and lifestyle that Lago Vista is famous for: boating, fishing, golf, and an ever-growing community.
Seize this opportunity to build in a coveted area that combines natural beauty with modern amenities. Don’t wait—contact us today and start envisioning your future home by the lake! (Buyer to verify floodplain status, building requirements, and all information provided.)
Property Type
Land
Lot Size
0.36 acres
Listed by eXp Realty, LLC
Property Details
Lot Features
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% ($5K)
$25,000
Luxury property intelligence
A sourced read on Highland Lake Estates Sec 31 pricing, timing, and property scale. No automated valuation claim.
List price
$25,000
Price per sqft
Not available
Vs. Highland Lake Estates Sec 31 median
Not available
Days on market
422 days
Original to current
$30K reduction
$55K original
Active inventory context
Ask for current inventory
Source: MLS Grid / Unlock MLS and Keenan Group review as of May 5, 2026.
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#1 ABOR Team 2024 with $1B+ career sales volume
At $25,000, 21100 Santa Carlo Ave is in the Highland Lake Estates Sec 31 market where there are currently 251 active listings in 78645. The Keenan Group has completed 6 transactions in 78645 as part of 1,000+ career sales totaling $1B+ across Austin.
Answers use visible listing facts, school context, and neighborhood data available on this page. Verify time-sensitive details before making decisions.
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