4400 Island Ave, Austin TX 78731
Austin, TX 78731 · Island At Mount Bonnell Shores
Single Family Residence for sale in Island At Mount Bonnell Shores
Overview
Property Description
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.
Financial Info
- Price
- $6,250,000
- $ / Sqft
- $866
- HOA
- Yes - Mandatory / $3,000 / Annually
- HOA Name
- Island at Mt. Bonnell
- HOA Includes
- Common Area Maintenance
- Tax Rate
- 2.046485%
- Est. Taxes
- $114,303.92
- Tax Year
- 2026
- Exemptions
- None
Legal Info
- Address
- 4400 Island Ave
- County
- Travis
- City
- Austin
- State
- TX
- Zip
- 78731
- Subdivision
- Island At Mount Bonnell Shores
- Legal Description
- LOT 1-A BLK B ISLAND AT MT BONNELL SHORES THE AMENDED PLAT OF LOTS 1&2
- Parcel
- 01290705100000
Interior Features
- Floor
- Stone
- Num Living
- 4
- Dining
- 2
- Kitchen
- Breakfast Bar, Kitchen Island, Pantry
- Appliances
- Built-In Oven(s), Dishwasher, Disposal, Gas Cooktop, Double Oven, Refrigerator, Stainless Steel Appliance(s)
- Laundry
- Laundry Room, Main Level
- Master Bed
- Double Vanity, Primary Bedroom on Main, Walk-In Closet(s)
- Master Main
- Yes
- Fireplaces
- 2
- Fireplace Description
- Living Room, Outside
- Interior Features
- Bookcases, Breakfast Bar, Built-in Features, High Ceilings, Stone Counters, Crown Molding, Double Vanity, Entrance Foyer, French Doors, Interior Steps, Kitchen Island, Multiple Dining Areas, Multiple Living Areas, Pantry, Primary Bedroom on Main, Soaking Tub, Study/Home Office, Walk-In Closet(s), Wet Bar, Smoke Detector(s), Window Treatments
General Info
- Beds
- 5 Total / 1 Main Level / 4 Other Level
- Full / Half Baths
- 4 / 2
- Prop Type
- Residential
- Property Type
- Single Family Residence
- Stories
- 2
- Year Built
- 1996 / Resale
- Square Feet
- 7,219 / Public Records
- Garages
- 3
- Garage Desc
- Attached, Garage
- Foundation
- Slab
- Roof
- Tile
- Construction
- Masonry – All Sides
- Acres
- 1.60
- Lot Description
- Trees-Large (Over 40 Ft), Waterfall
- Restrictions
- Deed Restrictions, Development Type
- Flood Plain
- Yes-500 yr
- View
- Hill Country, Lake, River
- Water Access
- Yes
- Waterfront
- Yes
- Area
- 1B
Utility Info
- Water
- Public
- Sewer
- Public Sewer
- Utilities
- Electricity Available, Natural Gas Available, Underground Utilities
- Heat
- Central, Natural Gas
- A C
- Central Air
Exterior Features
- Fence
- None
- Exterior Features
- Balcony, Boat Lift, Boat Slip, Boat Dock - Private, Private Yard, Covered, Patio
- Pool On Property
- No
- Area Amenities
- Gated
Price history
| Date | Event | Price | Change |
|---|---|---|---|
| Sep 28, 2026 | Price Decrease | $6,250,000−$250,000 (−3.8%) | −$250,000 (−3.8%) |
| Sep 18, 2026 | Back On Market | — | |
| Sep 13, 2026 | Active Under Contract | — | |
| Jul 1, 2026 | New Listing | — |
Taxes
TCAD account 360034
Uses rates from the supplied 2026 TCAD package. The file does not identify adopted or proposed status.
| Taxing Entity | Rate per $100 | Taxable Value | Estimated Tax |
|---|---|---|---|
| AUSTIN COMM COLL DIST | 0.103400 | $5,585,378 | $5,775.28 |
| AUSTIN ISD | 0.925200 | $5,585,378 | $51,675.92 |
| CITY OF AUSTIN | 0.524017 | $5,585,378 | $29,268.33 |
| TRAVIS COUNTY | 0.375845 | $5,585,378 | $20,992.36 |
| TRAVIS COUNTY HEALTHCARE DISTRICT | 0.118023 | $5,585,378 | $6,592.03 |
| Ordinary property tax estimate | 2.046485 | $114,303.92 |
Informational estimate, not a tax bill or taxes paid. Exemptions and tax ceilings can make taxes differ from the combined rate multiplied by one taxable value. PID assessments and other special charges are excluded; collector coverage has not been established.
Source: Travis County
- Owner
- KT RESIDENCE TRUST
- Legal
- LOT 1-A BLK B ISLAND AT MT BONNELL SHORES THE AMENDED PLAT OF LOTS 1&2
- Geo ID
- prop:360034
- Acreage
- 1.60
- Exemption Type
- None on record
- MLS estimated annual taxes
- $114,303.92
- MLS tax year
- 2026
Annual taxes billed are the Tax Imposed amounts reported in the latest available Travis Tax Office statement. Exemptions and tax ceilings may prevent combined rate × taxable value from equaling the billed amount. Other collectors or assessments may not be included.
| Year | Appraised Value | Combined Rate per $100 | Annual Taxes Billed |
|---|---|---|---|
| 2025 | $5,585,378 | 2.046485 | $114,303.92 |
| 2024 | — | 1.981814 | $119,754.61 |
| 2023 | — | 1.809247 | $82,852.61 |
| 2022 | — | 1.974923 | $100,487.02 |
| 2021 | — | 2.176679 | $99,601.16 |
| 2020 | — | 2.226665 | $53,735.85 |
Combined rates exclude PID placeholder rates. Historical amounts reflect the statement’s snapshot and may change after later corrections; they do not describe payment status. Appraisal values come from the legacy CAD source.
Source: Travis County
Schools
School Info
- District
- Austin ISD
- Elementary
- Highland Park
- Middle
- Lamar (Austin ISD)
- High
- McCallum
Maps
Financing
Your preferences
- 20% down
- Conv/Jumbo
- 30 years
- 6.50% rate
Saved on this device
Estimated monthly payment
$46,336 / mo
20% down · 6.50% interest · 30-year fixed
Estimated monthly payment $46,336
- Principal & interest
- $31,603
- Property taxes
- $9,525
- Homeowners insurance
- $5,208
*PITI only
These figures are estimates for general information only — not a loan offer, a quote, or a guarantee of financing terms.
| Year | Starting balance | Principal paid | Interest paid | Ending balance | Principal vs interest |
|---|---|---|---|---|---|
| 1 | $5,000,000 | $55,886 | $323,355 | $4,944,114 | |
| 2 | $4,944,114 | $59,629 | $319,612 | $4,884,485 | |
| 3 | $4,884,485 | $63,623 | $315,618 | $4,820,862 | |
| 4 | $4,820,862 | $67,883 | $311,357 | $4,752,979 | |
| 5 | $4,752,979 | $72,430 | $306,811 | $4,680,549 | |
| 6 | $4,680,549 | $77,281 | $301,960 | $4,603,268 | |
| 7 | $4,603,268 | $82,456 | $296,785 | $4,520,812 | |
| 8 | $4,520,812 | $87,978 | $291,262 | $4,432,834 | |
| 9 | $4,432,834 | $93,870 | $285,370 | $4,338,963 | |
| 10 | $4,338,963 | $100,157 | $279,084 | $4,238,806 |
- Year 1$4,944,114
- Principal paid
- $55,886
- Interest paid
- $323,355
- Starting balance
- $5,000,000
- Year 2$4,884,485
- Principal paid
- $59,629
- Interest paid
- $319,612
- Starting balance
- $4,944,114
- Year 3$4,820,862
- Principal paid
- $63,623
- Interest paid
- $315,618
- Starting balance
- $4,884,485
- Year 4$4,752,979
- Principal paid
- $67,883
- Interest paid
- $311,357
- Starting balance
- $4,820,862
- Year 5$4,680,549
- Principal paid
- $72,430
- Interest paid
- $306,811
- Starting balance
- $4,752,979
- Year 6$4,603,268
- Principal paid
- $77,281
- Interest paid
- $301,960
- Starting balance
- $4,680,549
- Year 7$4,520,812
- Principal paid
- $82,456
- Interest paid
- $296,785
- Starting balance
- $4,603,268
- Year 8$4,432,834
- Principal paid
- $87,978
- Interest paid
- $291,262
- Starting balance
- $4,520,812
- Year 9$4,338,963
- Principal paid
- $93,870
- Interest paid
- $285,370
- Starting balance
- $4,432,834
- Year 10$4,238,806
- Principal paid
- $100,157
- Interest paid
- $279,084
- Starting balance
- $4,338,963
Nearby
12 closest listings to 4400 Island Ave, Austin TX 78731 (within 2 miles).
Courtesy of Moreland Properties · (512) 480-0848
Listings courtesy of ACTRIS as distributed by MLS GRID.