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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
$2400/mo
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 78731 median of $1,225,000.
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 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 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.
#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
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)
$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. Island At Mount Bonnell Shores median
Not available
Days on market
2,217 days
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.
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District guide, nearby schools, and homes by attendance area
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Pricing, prep, launch timing, and Compass marketing strategy
#1 ABOR Team 2024 with $1B+ career sales volume
With 20% down ($1,060,000) on a 30-year fixed mortgage at approximately 6.75%, the estimated monthly payment for 4303 Island Ave is around $35,488 including principal, interest, and estimated taxes. Actual payment varies by rate, down payment, insurance, and HOA fees.
At $5,300,000, 4303 Island Ave is in the Island At Mount Bonnell Shores market where there are currently 54 active listings in 78731. The Keenan Group has completed 107 transactions in 78731 as part of 1,000+ career sales totaling $1B+ across Austin.
4303 Island Ave includes verified waterfront access: Lake Front. Buyers should confirm shoreline, dock rights, and floodplain status during due diligence.
4303 Island Ave sits on a 1.05-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.
4303 Island Ave is part of a managed community with HOA dues of $2,400 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
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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