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Verified property facts
21809 O Neill 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.
21809 O Neill 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.
With 20% down ($7,400) on a 30-year fixed mortgage at approximately 6.75%, the estimated monthly payment for 21809 O Neill Ave is around $260 including principal, interest, and estimated taxes. Actual payment varies by rate, down payment, insurance, and HOA fees.
At $37,000, 21809 O Neill Ave is in the Highland Lake Estates 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.
#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.
City lot with new houses nearby on Thurman. Buyer will need to determine the cost to get utilities to this lot. Nice buildable lot. Lake Travis is only 1/4 mile away. Enjoy all the amenities for the area including golf course, lake access, tennis and pickleball courts, library, 9 parks, pool, airport, and much more.
Property Type
Land
Lot Size
0.21 acres
HOA
$200/mo
Listed by Venture Partners R.E.
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% ($7K)
$37,000
Luxury property intelligence
A sourced read on Highland Lake Estates pricing, timing, and property scale. No automated valuation claim.
List price
$37,000
Price per sqft
Not available
Vs. Highland Lake Estates median
Not available
Days on market
101 days
Original to current
No verified reduction
$37K original
Active inventory context
Ask for current inventory
Source: MLS Grid / Unlock MLS and Keenan Group review as of May 10, 2026.
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#1 ABOR Team 2024 with $1B+ career sales volume
21809 O Neill Ave is part of a managed community with HOA dues of $200 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.
Best Match
Balanced against price, location, and layout so nearby lookalikes rise first. Similar properties in Highland Lake Estates
Recent sales for market context
