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$5,300,000
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The Marque at Island Cove on Lake Austin. For those who seek waterfront living yet covet privacy and quiet, there simply isn't a better choice. Located on a paradisical acre replete with waterfall, grotto, gorgeous cypress trees and an amazing resort style pool with lazy river this deeply curated home leaves only one question, "why leave"? It blends entertainment and every day living seamlessly. Located in The Island, coveted by creatives and influencers, it's also minutes to downtown and every key business location in Austin. The fully integrated layout of the home fits multiple lifestyle needs with three wings of bedrooms centered around living spaces, kitchen and dining spaces. The exterior living spaces combine with the one-of-kind pool offering a stone cabana swim-up bar, seating integrated into the pool, and a connecting winding lap pool to the Jacuzzi; all steps from interior living areas. The state of art theater whisks you away to the Golden era of Hollywood yet is just a staircase away from the kitchen. The grand coffered entrance flanked by majestic winding antebellum marble staircases lead right to the comfortable master with multiple balconies as well as a private home office suite where one’s creativity will surely be inspired. The home is a continuous display and appreciation of supreme quality. The grand architecture gracefully meets artisan carved slabs, master carpentered arched windows, groined brick ceilings, gorgeous hand-laid mosaic tile covering 100% of all pool surfaces and true two-piece European tile roof. This level of curation, quality and architecture simply cannot be re-created nor matched at this value. Fully self-sustained casita for in-laws or friends next to the two-slip boat dock with spaces for jet skis. Savant Home Control System for full automation of lighting, audio, video, security and pool functions. Elevator for all 3 levels of home.
Property Type
Residential
Year Built
1999
Lot Size
1.05 acres
$/Sq Ft
$675
HOA
$2,400/year
Garage
4 spaces
Pool
Yes
Listed by Kuper Sotheby's Itl Rlty
Verified property facts
4303 Island Ave is listed at $5,300,000 with 6 bedrooms, 6 full, 1 half bathrooms, 7,852 square feet, 1.05-acre lot. This places it above the ZIP 78731 single-family closed-sale median price of $1,200,000 (ZIP 78731 geography · single-family closed sales · median sale price · trailing 12 months as of Sep 4, 2026).
4303 Island Ave is zoned for Austin ISD with assigned schools: Highland Park (4/10) (elementary), Lamar (Austin ISD) (middle), McCallum (8/10) (high). School assignments should be verified directly with the district.
4303 Island Ave is a Residential built in 1999 featuring 6 bedrooms, 6 full, 1 half bathrooms, 7,852 square feet, 1.05-acre lot.
4303 Island Ave is listed by Kuper Sotheby's Itl Rlty. Keenan Group at Compass presents this IDX listing and provides the accompanying market analysis using MLS Grid / Unlock MLS data reviewed as of Jun 2, 2026.
#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
1 record on file
Every recorded listing, sale, and lease at 4303 Island Ave, whoever represented it.
Prices shown are list prices. Closed sale prices are available to registered clients in accordance with ACTRIS rules.
Listing timeline 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+47.0% | — | $6,843,407 | — | — |
2024-5.0% | — | $4,654,020 | $5,378,940 | $1,521,060 |
2023-16.9% | — | $4,900,000 | $2,019,600 | $2,634,420 |
2022+23.0% | — | $5,899,295 | $2,019,600 | $2,880,400 |
2021 | — | $4,795,725 | $2,861,100 | $3,038,195 |

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% ($1.1M)
Adjustable assumption - not a lending recommendation.
$5,300,000
Luxury property intelligence
A sourced read on Island At Mount Bonnell Shores pricing, timing, and property scale. No automated valuation claim.
List price
$5,300,000
Price per sqft
$675/sqft
Vs. Neighborhood guide reference price
Not available
Days on market
Not available
Original to current
No verified reduction
$5.3M original
Active inventory context
Ask for current inventory
Source: MLS Grid / Unlock MLS and Keenan Group review as of Jun 2, 2026.
Request Private Market AnalysisZIP-level neighborhoods, schools, lifestyle, and Austin market context
Active 78731 listings and Northwest Hills market context
District guide, nearby schools, and homes by attendance area
Private Austin CMA, TCAD context, and pricing strategy
Pricing, prep, launch timing, and Compass marketing strategy
#1 ABOR Team 2024 with $1B+ career sales volume
The most recent annual property tax for 4303 Island Ave is $95,851. 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.
This page does not assume a mortgage rate or publish a monthly payment for 4303 Island Ave. A property-specific estimate requires a current lender rate, chosen down payment, taxes, insurance, and any verified association dues.
As of Jun 2, 2026, 4303 Island Ave is offered at $5,300,000. The current MLS snapshot shows 66 active listings in 78731. Keenan Group has completed 108 verified transactions in 78731 within its 1,000+ completed transactions and $1B+ career volume across Austin.
The MLS listing marks 4303 Island Ave as waterfront. The reported waterfront feature is 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 $2,400 annual for 4303 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.
Car-Dependent
Minimal Transit
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.
7 events on record
Current Price
$5,300,000
Timeline data compiled from MLS records and public records. Information deemed reliable but not guaranteed.
| Year | Taxes | Total Assessment | Land | Additions |
|---|---|---|---|---|
2025+47.0% | — | $6,843,407 | — | — |
2024-5.0% | — | $4,654,020 | $5,378,940 | $1,521,060 |
2023-16.9% | — | $4,900,000 | $2,019,600 | $2,634,420 |
2022+23.0% | — | $5,899,295 | $2,019,600 | $2,880,400 |
2021 | — | $4,795,725 | $2,861,100 | $3,038,195 |
Timeline merges MLS activity (when permitted) with public records. Some details may be restricted to registered VOW clients.
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