45 Beach Ln · Westhampton Beach, NY 11978

$4,750,000

7 bd · 7.0 ba · 9,424 sqft · SingleFamily public records · 8 Days on market

Built 1989 1.20 ac lot

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Why this score? — see what drove the D- grade

The composite is a weighted blend of 9 inputs, each scored 0–100. Each bar is that input's sub-score; the figure is the points it added to the 100-point composite (weight × sub-score).

• Appreciation +10.0/10.0
• ARV discount +7.5/15.0
• Schools +6.6/10.0
• Cash flow +6.5/30.0
• Livability +3.2/5.0
• Rent growth +2.5/5.0
• Condition / age +2.5/5.0
• DSCR +0.8/10.0
• 1% rule +0.3/10.0

Listing remarks

Located in the heart of Westhampton Beach Village, this extraordinary 9,500-square-foot estate is set on 1.20 beautifully landscaped acres, offering a rare blend of historic grandeur, modern comfort, and the quintessential Hamptons lifestyle. Rich in character and timeless elegance, the residence is introduced by a grand foyer that immediately sets the tone for the home's impressive scale. Beyond, an oversized historic ballroom serves as the centerpiece of the estate, featuring soaring ceilings, a wood-burning fireplace, floor-to-ceiling windows, and custom built-in bookshelves. Originally dating to the 1800s, this remarkable space is steeped in history and craftsmanship, with rich walnut m

Key facts

• Historic ballroom
• In-ground pool
• Spa-inspired bath

Tags

• HISTORIC BALLROOM
• OVERSIZED FORMAL DINING ROOM
• CHEF'S KITCHEN
• IN-GROUND POOL
• OWN BALCONY
• SPA-INSPIRED BATH

Property features AI

Exterior

• Parking: Attached garage; Two garage spaces; No carport
• Utilities: Septic tank; Cable available and connected; Electricity available and connected
• Home design: Single family residence
• Construction: Cedar and frame construction
• Exterior features: In-ground private pool; Cedar and frame construction; Not waterfront

Interior

• Kitchen: Dishwasher; Microwave; Oven; Refrigerator; Stainless steel appliances
• Bathrooms: Six full bathrooms; Two half bathrooms
• Heating & cooling: Oil heating; Central air conditioning
• Interior features: Built-in features; Central vacuum; Eat-in kitchen; Entrance foyer; Granite counters; High ceilings; Whole-house speakers
• Laundry & utility: Washer; Dryer

What this means for you Summary

Snapshot

• This is a 7-bed/7.0-bath single-family listed at $4.75M.

Deal economics

• At list price, monthly cash flow is $-8k ($-95k/yr) — negative.
• To cash-flow at today's rent, offer at most $3.35M (29.6% below list).
• To meet the 1% rule (rent ≥ 1% of price), the offer needs to be $2.51M (47.1% below list).
• Recommended offer: $2.51M (47.1% below list) — sets the bar for 1% rule.
• Cap rate 4.3% vs local median 9.3% in Westhampton Beach — below-typical yield; the buyer is paying a premium for something (appreciation thesis, condition, location) that the cap rate doesn't capture.

Location & tenants

• Location reads 64/100 on livability (#740 in NY) — a middle-class / working-renter tenant base. Strengths: crime A+, employment A+; Watch: amenities F, commute F, cost of living F.
• Westhampton Beach Union Free School District (suburban): math 72% / reading 75% proficiency, ranked #81 of 590 in NY (top 14%) — strong family-tenant draw, lease renewals of 3-5y typical.
• Zoned schools: Westhampton Beach Elementary School (math 67% / reading 67%, grade B+, #525 of 2,108 statewide, top 27%, 356 students, 43% FRL); Westhampton Middle School (math 61% / reading 63%, grade B+, #136 of 729 statewide, top 20%, 434 students, 26% FRL); Westhampton Beach Senior High School (math 90% / reading 96%, grade A+, #147 of 1,100 statewide, top 14%, 964 students, 24% FRL).
• Market conditions: 112 active listings in the ZIP; high-income renter base; 1,366 units permitted in Suffolk County in 2024 (216 in 5+ unit buildings).
• At $25,126/mo this rent would consume 241% of the median local household income ($125k/yr) (locally 43% of renters already pay >50% of income on rent) — very limited rent-growth headroom before tenants either downsize or default.

Forward outlook

• In year one you build about $508k of equity ($33k loan paydown + $475k appreciation (10.0% local appreciation)).
• Suffolk County population projected to shrink 5% by 2050 — rents likely to lag national; underwrite the cash flow, not the appreciation.
• By year 2, paydown + projected appreciation supports a ~$816k cash-out refi (75% LTV) — recoverable capital for the next deal without selling this one.

Negotiation context

• Only 8 days on market — expect competitive offers; lowballing is unlikely to land.

Risks & watch-outs

• Climate carrying-cost: severe wind risk, 80% chance of damaging wind over 30y — expect insurance premiums to compound above CPI over the hold.

Recommended offer $2,512,644 (47.1% below list)

Questions for the listing agent

1. What do current leases actually rent for vs. the listed asking? Can we see a recent rent roll and the last 12 months of T-12 income?
2. Is there a deadline driving the sale (1031 exchange, divorce, estate, relocation)? That informs how much negotiation room exists.
3. Schools are A-rated — typically a magnet for longer-tenancy family renters. What's the average tenant stay here, and is there a school-zone premium baked into asking?
4. The area grade is low — what's the realistic commute time and amenity access for the typical tenant pool here? Any planned neighborhood developments (good or bad) we should know about?
5. What's the average days-on-market for RENTAL listings here right now (not sales)? A rising rental-DOM trend means longer vacancies and softer asking-rent achievability than the comps imply.
6. What's the recent tenant-quality profile in this submarket — average credit score on applications, eviction rate, late-payment / NSF rate, and stable-employment percentage? A property-management company in the area should have these aggregated.
7. How much new for-sale + rental construction is in the pipeline within 1–3 miles? Heavy new supply typically softens prices + rents 12–24 months out; constrained supply supports both.

Investment metrics

• 1% rule: 0.53% ✗
• Cap rate: 4.28%
• Cash-on-cash: -7.17%
• DSCR: 0.68
• GRM: 15.8

CMA / ARV

No comps found within radius.

Projected returns pro-forma

10.0% appreciation · 3.0% rent growth · sell at horizon

5-year hold

• IRR: 19.2%
• Equity multiple: 2.56×
• Total profit: $2,077,884
• Equity at exit: $4,279,176

10-year hold

• IRR: 17.7%
• Equity multiple: 5.90×
• Total profit: $6,511,855
• Equity at exit: $9,228,205

Cash invested: $1,330,000 (down + closing). Projections, not guarantees.

Landlord ↔ Tenant lean methodology

• Overall (STATE): 15 Strongly Tenant-Friendly
• State New York: 15 Strongly Tenant-Friendly · D+10
• County: — inherits STATE
• City: — inherits STATE

NYC rent stabilization (~1M units); 2019 HSTPA strengthened tenant rights; courts deeply backlogged.

Methodology + full state rankings →

ZIP-level market 11978

• Home prices YoY: 2.9%
• Active inventory: 112
• Price-to-rent: 15.8×

Monthly cashflow live

• Estimated rent: $25,126 medium
• Mortgage (P&I): −$24,910
• Tax from tax record: −$912 /mo · $10,942/yr
• Insurance: −$1,979
• HOA: −$0
• Vacancy / Maint / Mgmt: −$5,277
• Net cashflow: $-7,951

Break-even live

Break-even rent $35,191

Max offer price $3,345,482

Occupancy floor —

UW: 25.0% down · 7.5% · 30yr · 1.5% tax · 5.0% vac · 8.0% maint · 8.0% mgmt

Financing live

Cash to close

• Down payment: $1,187,500
• Closing costs: $142,500
• Reserves months: —
• Total cash needed: —

Listing history 6 events

1. 2026-06-18
   days on market $4,750,000 Active 8 DOM
2. 2026-06-17
   days on market $4,750,000 Active 7 DOM
3. 2026-06-16
   days on market $4,750,000 Active 6 DOM
4. 2026-06-15
   days on market $4,750,000 Active 5 DOM
5. 2026-06-13
   remarks 699-char remark
6. 2026-06-13
   listed $4,750,000 Active 3 DOM

ⓘ Source: listings_history table (triggers on properties + properties_extension) + one-shot backfill from property_details.listing_events for pre-trigger history.

Tax reassessment forecast NY · Partial reset (capped growth)

• Current annual tax: $10,942 · $912/mo
• Projected year-2 tax: $45,609 · $3,801/mo
• Expected delta: +$34,666/yr (+$2,889/mo · 316.8%)

ⓘ Screening estimate from a state-policy table — verify with the county assessor before closing.

Climate risk First Street

• 🌊 Flood 4/10 Moderate FEMA zone X (shaded) · 16% chance over 30 yrs
• 🔥 Wildfire 1/10 Low
• 🌡 Heat 4/10 Moderate 8 d/yr ≥90°F today · 22 d/yr by 30 yrs out
• 💨 Wind 8/10 Severe 80% chance of damaging wind over 30 yrs
• 🫁 Air quality 2/10 Low 2 unhealthy d/yr today · 2 by 30 yrs out

Taxation est. · year 1

• Rental income: $301,517
• − Mortgage interest: −$266,074
• − Property taxes: −$10,942
• − Insurance: −$23,750
• − Repairs & maintenance: −$24,121
• − Management: −$24,121
• − Depreciation: −$138,182
• Taxable loss: −$185,674
• Est. tax savings @ 24.0%: +$44,562
• After-tax cash flow: $-50,846/yr

For passive investors: Depreciation is non-cash, so a rental often shows a tax loss while cash-flowing — sheltering income. Rental losses are passive: they offset passive income freely, and up to $25,000/yr can offset ordinary (W-2) income if you actively participate and your MAGI is under $100k (phasing out to $0 by $150k); unused losses carry forward. On sale, claimed depreciation is recaptured at up to 25%, and gains may owe capital-gains tax (a 1031 exchange can defer both). Figures are a year-1 estimate at your 24.0% rate — not tax advice; consult a CPA.

Schools (NCES district)

• District: Westhampton Beach Union Free School District
• NCES district ID: 3631020
• Math proficiency: 72% ▼ -5.00%
• Reading proficiency: 75% ▲ 3.00%
• Median HH income: $88,137
• Composite: 65.91/100
• National rank: #444
• State rank: #81 of 590 in NY

Livability — Westhampton Beach

• Score: 64/100
• State rank: #740
• US rank: #14093

Category grades

Amenities F Commute F Cost of living F Crime A+ Employment A+ Housing C Health & safety F User ratings A

Schools grade is shown separately in the Schools card above.

Census & demographics

• Census place: Westhampton Beach, NY
• County: Suffolk County · 679,920 people
• City population: 4,705
• Metro: New York-Newark-Jersey City, NY-NJ-PA
• Population (ZIP): 4,705
• Household income: $125,179
• Rent vs Own: 11.8% rent · 88.2% own
• Severe rent burden: 43.0

Population outlook (Suffolk County) Hauer SSP2

• Today (2025): 1,505,262 people
• By 2030: 1,498,318 · -0.5%
• By 2040: 1,471,101 · -2.3%
• By 2050: 1,424,848 · -5.3%
• By 2075: 1,337,157 · -11.2%
• By 2100: 1,217,720 · -19.1%

Race, ethnicity, and origin ACS 2023

• Neighborhood character: Predominantly White (72%)
• Race & ethnicity: White 72% Two or more races 14% Hispanic / Latino 11% Black 6% Asian 2%
• Hispanic origin (detail): Puerto Rican 1%
• Common ancestry: Romanian 7% Scotch-Irish 2% Italian 2%
• Foreign-born: 14% · Canada, Jamaica, China
• Languages at home: 84% English-only · Spanish 10% Other Indo-European 2% Russian/Polish/Slavic 1%

Political lean MEDSL · Suffolk

• 2024 margin: Lean R (+10.0) · D 45.0% · R 55.0%
• 2008→2024 swing: -16.0pp toward R · 2008: 6.0pp · 2024: -10.0pp
• All cycles: 2024: R+10.0 2020: R+0.0 2016: R+8.2 2012: D+2.9 2008: D+6.0

Not yet ingested

• Civics: —

Market trends

• HPI YoY: ▲ 13.02%
• Current HPI: 460.3964
• Rent YoY: —
• Metro: New York-Newark-Jersey City, NY-NJ-PA
• State GDP YoY: ▲ 2.60%
• F500 in state: 92

Industry mix (Fortune 500 HQ in NY)

Industry	F500 HQs	Revenue
▸Financial Services	10	$950B
▸Consumer Goods	9	$162B
▸Insurance	4	$225B
▸Telecommunications	2	$144B
▸Pharmaceuticals	2	$112B
▸Media / Entertainment	2	$69B

Price history

1 event — show timeline

• 2026-06-10 Listed $4,750,000 OneKey® MLS as Distributed by MLS Grid

Property tax history

-3.8%/yr

Latest (2025): $10,942 · +11.9% YoY. Source: county tax records.