Duplex with Off-Street
New
For Sale
$680,000
100 William St, New Haven, CT 06511
The property includes two residential units, on-site laundry, and a landscaped yard.
Property Size2,400 SF
Days on Market4
Property Features for 100 William St
General Information
Standard status
Active
Size
2,400 SF
Property subtype
Multi Family
Additional Details
Public Transit
Yes
Multifamily Units
2
Amenities
off-street parking
on-site laundry
landscaped yard
Building Details
Building Size
2,400 SF
Year Built
1880
Listing Agency:
(203) 209-1266
Listed By:
Maryrose Krafcik
(203) 209-1266
Source:
Elliman
Added: Aug 20
Changed: Aug 23
Last Checked: Aug 23 at 6:17AM
Displayed information is deemed reliable but is not guaranteed and should be independently verified. All listing content including descriptions, pricing, images are the copyrighted material of Maryrose Krafcik
Investment Insights
Based on property information with market context.
Located at 100 William St in New Haven, Connecticut, this duplex contains 2 residential units within a building constructed in 1880. Property features include off-street parking, on-site laundry, and a landscaped yard with established plantings and arranged outdoor spaces.
The property is near Yale University, downtown New Haven, dining, shopping, and cultural attractions. Public transportation is accessible, while recorded walk and bike scores are 89 and 87, respectively. The transit score is 44.
The property is near Yale University, downtown New Haven, dining, shopping, and cultural attractions. Public transportation is accessible, while recorded walk and bike scores are 89 and 87, respectively. The transit score is 44.
Key Highlights
- 2‑unit duplex at 100 William St, New Haven, CT 06511
- Building constructed in 1880
- Off‑street parking and on‑site laundry
Financial Insights
Estimated NOI and Cap Rate
NOI = area × lease_rate × (100 − vacancy) / 100 × (1 − expense_ratio). Net Operating Income — what the owner takes home each year before mortgage payments and income tax. Effective rent (asking rent minus vacancy losses) minus operating costs (taxes, insurance, maintenance, management).
NOI / Yr
$40,397
Cap rate = NOI / list price × 100. Capitalization rate — annual return on a fully cash purchase, before financing. NOI divided by price. Higher means more income per dollar invested, but usually also more risk or older condition. 5–8% is typical for stabilized commercial property; double digits often signal distressed deals.
Cap Rate
5.94%
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$807,940
$807.9K
Cap Rate 7%
$577,100
$577.1K
Cap Rate 9%
$448,856
$448.9K
Market Conditions
NOI Build-Up for 2,400 SF
Vacancy — income lost from leasable area expected to sit empty during the year, subtracted from gross rent.
EGI (Effective Gross Income) — gross rent minus vacancy losses, the realistic income before paying operating costs.
OpEx (Operating Expenses) — recurring costs to operate the property (property tax, insurance, utilities, maintenance, management); excludes financing and capital improvements.
NOI (Net Operating Income) — income a property generates after operating costs but before financing and taxes.
Gross rent
$61.9K $25.80/SF
− Vacancy
−$4.2K −$1.75/SF
EGI
$57.7K $24.05/SF
− OpEx
−$17.3K −$7.21/SF
NOI
$40.4K $16.83/SF
Area
New Haven, CT
Vacancy
6.80%
Lease Rate
$25.80 /SF/Yr
Expense Ratio
30.00%
Simulate Cap Rate and NOI
Suggested Prices Based on Cap Rates
Cap rates vary significantly by property type, market, and asset quality.
Typical U.S. stable-market ranges:
Multifamily — 4.5% to 6.5% (Class A in primary markets often sub-5%; Class C in secondary markets 6%+)
Industrial / Logistics — 5.0% to 7.0% (compressed heavily in recent years due to e-commerce demand)
Office — 6.5% to 9%+ (wide spread post-2020; CBD Class A vs. suburban Class B varies dramatically)
Retail — 5.5% to 8.5% (grocery-anchored on the low end, unanchored strip centers higher)
Hospitality / Hotels — 7.5% to 10%+ (higher due to operational risk)
Self-Storage — 5.5% to 7.5%
Medical Office — 6.0% to 7.5%
Net Lease (single tenant, credit) — 5.0% to 7.0% depending on tenant credit and lease term
Rules of thumb:
Primary markets (NYC, SF, LA, Boston, DC) trade at lower cap rates than secondary/tertiary markets, often by 100–200 bps (bps, aka basis points; 1 bp = 0.01%).
Class A assets trade ~50–150 bps tighter than Class B, and Class B tighter than Class C.
Cap rates move inversely with price — a lower cap rate means a higher price for the same NOI.
Spread to the 10-year Treasury is a common benchmark; historically 200–400 bps over the 10-year.
Cap Rate 5%
$807,940
Cap Rate 7%
$577,100
Cap Rate 9%
$448,856
Alternative Uses
Best Use
Multifamily LT 5
$577.1K
$505.0K – $673.3K
NOI $40,397 @ 7.0% cap · market cap 5.94%
Second Best
Apartment 5plus
$537.0K
$469.9K – $626.5K
NOI $37,591 @ 7.0% cap · market cap 5.53%
Theoretical Best
Office A
$772.0K
$675.5K – $900.7K
NOI $54,041 @ 7.0% cap · market cap 7.95%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
Property Profile
Current Use
Lease Details
2
Residential units
Location Intelligence
Trade Area within ½ mile
4,077
Businesses Nearby
Explore this area
Business Placement
Demographics for 06511, CT
55,879
Population
24,579
Households
2.3
Avg Household Size
29
Median Age
48%
College-Educated
91%
High-School Grad
5.8 sq mi
ZIP Area
9,634
Density / Sq Mi
$56,300
Median Household Income
$34,409
Median Earnings
$1,534
Median Rent
$313,400
Median Home Value
Market
Vacancy Rate% for Multifamily in Northeast region
Questions? Ask Rey
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Frequently Asked Questions
What type of property is this?
Duplex - The property includes two residential units, on-site laundry, and a landscaped yard.
Where is this duplex located?
The property is located at 100 William St New Haven, CT.
What is the asking price?
The asking price for this property is $680,000.
What are key features of this property?
This property features: 2‑unit duplex at 100 William St, New Haven, CT 06511; Building constructed in 1880; Off‑street parking and on‑site laundry
