
5 bed, 4 bath, 7,219 sqft on 1.60 acres in Austin. Austin, TX 78731. $6,250,000. Austin ISD.
Situated within The Island, one of Austin’s most coveted gated communities on Lake Austin, this exceptional waterfront estate offers a rare combination of privacy, acreage, and direct lake access. Set on 1.6 acres along a serene canal, the property includes a spacious main residence and a separate one-bedroom guest house, creating an ideal setting for both everyday living and hosting family and friends. Designed for effortless entertaining, the main home features an open floor plan that connects expansive living spaces with the outdoors. Large windows frame peaceful water views, while the covered patio with a fireplace provides a year-round gathering space overlooking the property’s lush surroundings. Five bedrooms, four full bathrooms, and two half bathrooms offer flexibility and comfort across the thoughtfully designed residence. Outdoor amenities elevate the Lake Austin lifestyle, with a private dock featuring two boat slips for easy access to boating, paddleboarding, and waterfront recreation. Combining the security and prestige of The Island with generous acreage, guest accommodations, and coveted waterfront access, this property presents a rare opportunity to experience one of Austin’s most desirable lakefront settings. Tax and assessed values are estimates for illustration purposes only. All figures should be independently verified.
Listing information last updated September 28, 2026.
Listed by Moreland Properties
MLS# 9276221 • Active
IDX inquiries: Keenan Group at Compass · (512) 415-7653
Verified property facts
4400 Island Ave is listed at $6,250,000 with 5 bedrooms, 4 full, 2 half bathrooms, 7,219 square feet, 1.60-acre lot. This places it above the ZIP 78731 single-family closed-sale median price of $1,209,000 (ZIP 78731 geography · single-family closed sales · median sale price · trailing 12 months as of Oct 15, 2026).
4400 Island Ave is zoned for Austin ISD with assigned schools: Highland Park (elementary), Lamar (Austin ISD) (middle), McCallum (high). School assignments should be verified directly with the district.
4400 Island Ave is a Residential built in 1996 featuring 5 bedrooms, 4 full, 2 half bathrooms, 7,219 square feet, 1.60-acre lot.
The most recent annual property tax for 4400 Island Ave is $114,304. 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. 1,000+ homes sold and $1B+ in career sales over 25+ years in Austin.
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1 record on file
Every recorded listing, sale, and lease at 4400 Island Ave, whoever represented it.
Prices shown are list prices. Closed sale prices are available to registered clients in accordance with ACTRIS rules.
Price Change 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+22.0% | — | $5,585,378 | — | — |
2024-10.0% | — | $4,579,397 | $4,436,775 | $1,605,901 |
2023+11.2% | — | $5,088,149 | $2,673,000 | $1,906,397 |
2022+22.6% | — | $4,575,831 | $2,673,000 | $2,415,149 |
2021 | — | $3,733,400 | $2,673,000 | $1,902,831 |
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.
Excluded from this estimate: property taxes and home insurance. Each requires verified amount, cadence or unit, source, and as-of details.
HOA source: MLS Grid / Unlock MLS, as of 2026-10-15T11:07:11.634+00:00; normalized from annual dues.
20% ($1.3M)
Adjustable assumption - not a lending recommendation.
$6,250,000
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List price
$6,250,000
Price per sqft
$866/sqft
Vs. Neighborhood guide reference price
Not available
Days on market
106 days
Original to current
$250K reduction
$6.5M original
Active inventory context
Ask for current inventory
Source: MLS Grid / Unlock MLS and Keenan Group review as of Oct 15, 2026.
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This page does not assume a mortgage rate or publish a monthly payment for 4400 Island Ave. A property-specific estimate requires a current lender rate, chosen down payment, taxes, insurance, and any verified association dues.
As of Oct 15, 2026, 4400 Island Ave is offered at $6,250,000. The current MLS snapshot shows 58 active listings in 78731. Keenan Group has completed 91 verified transactions in 78731 within its 1,000+ completed transactions and $1B+ career volume across Austin.
The MLS listing marks 4400 Island Ave as waterfront. The reported waterfront feature is Canal Front, Lake Front. Confirm shoreline access, dock rights, and floodplain status from current property documents during due diligence.
The MLS listing reports HOA or association dues of $3,000 annual for 4400 Island Ave. It does not establish included amenities, services, rules, reserves, or current assessments; verify those items in current association documents.
Answers use visible listing facts, school context, and neighborhood data available on this page. Verify time-sensitive details before making decisions.
Homes sold by Keenan Group.
10 events on record
Current Price
$6,250,000
Timeline data compiled from MLS records and public records. Information deemed reliable but not guaranteed.
| Year | Taxes | Total Assessment | Land | Additions |
|---|---|---|---|---|
2025+22.0% | — | $5,585,378 | — | — |
2024-10.0% | — | $4,579,397 | $4,436,775 | $1,605,901 |
2023+11.2% | — | $5,088,149 | $2,673,000 | $1,906,397 |
2022+22.6% | — | $4,575,831 | $2,673,000 | $2,415,149 |
2021 | — | $3,733,400 | $2,673,000 | $1,902,831 |
Timeline merges MLS activity (when permitted) with public records. Some details may be restricted to registered VOW clients.
| Address | Offered At |
|---|---|
| 6109 Mountain Villa Cir | $3.20M |
| 7218 Valburn DR | $3.27M |
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