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863 Prospect Avenue
Property Overview
Active Listing
1 / 11
11 listing photos · Tap Enlarge for full-size view
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Specs
4
Beds
2
Baths
Interior Living Space (Sq Ft)
1230 sq ft
Lot Size (Sq Ft)
4,750 sq ft
Year Built
1954
Price/Sq Ft (Living Area)
557$
Price/Sq Ft (Lot Size)
144$
Lifestyle
Walk Score
0
Transit Score
20
Neighborhood Vibe
A calculation based on nearby amenity density.
Taxes
%
FY 2024
Tax Year
Annual Tax
$2,448
Assessed Value
$319
Last Sale
1997
$55,000
Price History
Zestimate Range
$312k – $688k
+107.5%
since 2016
2016: $331kNow: $688k
Zillow Zestimate history · 111 data points
Safety & Hazards
A
Safety Rating
Based on Crime & Hazards
Crime Rate Index
Very Low
0/100
Flood Risk
Zone X
While Nassau County and the broader Long Island area have experienced severe storms and flooding, leading to disaster declarations in August 2024 and October 2024/December 2025, there are no documented flooding incidents specifically for 863 Prospect Avenue, Westbury, NY 11590, found in public summaries.
Zumintel Report
EVALUATED FOR: HOUSE HACK (LTR UNIT)
863 Prospect Avenue, Westbury, NY 11590
SINGLE_FAMILY•June 14, 2026•MLS #1012272
66/100
House Hack Score
Executive Summary
Verdict Locked
Based on current list price and market conditions.
Est. Price
$685,000
Square Feet
1,230
Year Built
1954
Configuration
4bd / 2ba
Market Context
- Pricing PositionPriced below the neighborhood median sale price of $801,000.
- Liquidity RiskLow risk, with an average Days on Market of 41 days and low inventory levels.
- NeighborhoodLocated in the New Cassel neighborhood of Westbury, with proximity to local shopping and transportation.
- Local MarketMedian Neighborhood Price: $801,000 (+3.3% YoY)Market Velocity: Increasing • Inventory: Low • Avg DOM: 41 days
- Investment PotentialEstimated Rent: $3,661/moCap Rate: 4.17% • 5-Year Growth: +17.6%
Location & Commute
- The property is situated in the New Cassel neighborhood, offering convenient access to local shopping and public transit, with a bus stop within a 2-minute walk and the Westbury LIRR station a 2-minute drive away.
- School ratings in the area are a consideration, with elementary and middle schools rated 3/10 and the high school rated 5/10 by GreatSchools.
- Westbury has actively pursued transit-oriented development (TOD) near its LIRR station, indicating ongoing efforts to enhance connectivity and increase housing options in the broader area.
Payment Calculator
$
$
Assumptions & Methodology
- •STR Data: Nightly yields mapped from regional AVM adjusted comps using a conservative median occupancy baseline. Verified via AI context.
- •Cap Rate: Derived mathematically (Market Adjusted Gross Yield minus standard expense, maintenance, and vacancy ratios).
- •Standard Math: Standard principle and interest amortized over 30-year fixed rates. Taxes and insurance are estimations.
Estimated Monthly Payment
$4,581
Principal & Interest
$3,464Operating Expenses/mo
$1,117House Hack Impact
Estimated Payment$4,581
-Projected Rental Income-$1,831
Net Payment Out-of-Pocket$2,750/mo
The conventional US estimated payment calculation is for informational purposes only. Users are free to make their financial decisions based on their personal economic, ethical and religious belief systems.
Financial Performance
Based on 6.5% rate · 20% down · 30-yr fixedInvestment Analysis Locked
Detailed Cash Flow, Cap Rate, and ROI projections are available for Builder+ plans or by using Top-Up Credits.
Upgrade to Unlock Investment DataComparative Market Analysis
Validate the asking price against recent comparable sales in the area. Includes similarity scoring, price adjustments, and exclusion reasoning.
Strategic Assessment
Key Advantages
- •Includes a full finished basement, offering potential for additional living space or rental income.
- •Recently updated kitchen with quartz counters, new stove, and fresh paint contributes to good move-in condition.
- •Convenient location near local shopping, transportation, and parkways.
- •The Westbury housing market shows positive year-over-year appreciation of 3.3% and low inventory.
Considerations
- •The property is currently a single-family home, and converting the finished basement into a separate legal rental unit may require significant zoning and permitting challenges, as local ordinances may restrict additional kitchens in accessory spaces and require larger lot sizes for two-family dwellings.
- •School district ratings for elementary and middle schools are low (3/10), which could impact family appeal.
- •The transit score is low (20), indicating limited public transportation options despite proximity to some bus routes and the LIRR station.
Due Diligence
- •Verify local zoning regulations with the Village of Westbury Building Department regarding the legality and requirements for adding a second kitchen or establishing a separate accessory dwelling unit within the finished basement.
- •Investigate specific permit requirements and costs associated with any planned modifications to create a separate rental unit.
10-Year Wealth Outlook
10-Year Wealth Outlook · Pro+
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Verdict Locked
Analyst Verdict
Based on current list price and market conditions.
STRONG BUY
Use-Case Alignment
living
High Match
Short-Term
Low Match
Living+STR
Medium Match
rental
Medium Match
House Hack
High Match
flip
Medium Match
Disclaimer: This report is for informational purposes only and does not constitute financial or real estate advice. Zumintel is not liable for any inaccuracies or the condition of the property. Users should conduct their own due diligence.
Definitions & Methodology
Cap Rate (Capitalization Rate)Net Operating Income (NOI) divided by the property asset value. It indicates the potential rate of return on the real estate investment.
Investment ScoreA proprietary composite score (0-100):
- 80-100: Excellent (Strong Cashflow & Potential)
- 60-79: Good (Stable, Moderate Returns)
- 40-59: Fair (Value Add Required)
- <40: Risky (Negative Cashflow/High Risk)
Walk ScoreA measure of walkability based on the distance to nearby amenities. 90-100 is a "Walker's Paradise".
Transit ScoreEstimates how well a location is served by public transport. Calculated based on distance to nearest stops and frequency.
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