Listed by CORE
$1,950,000
18 Congress Street — Suite 207
Details
Property Type Office
Sub Type Traditional Office
Square Footage 2,424
Net Rentable (SqFt) 2,424
Units 1
Cap Rate 6.34%
NOI $123,600
Occupancy 100%
Tenancy Single
Lease Type Absolute NNN
Rent Bumps Yes
Lease Options Tenant early termination option after Year 5
Pro-Forma Cap Rate 6.53%
Pro-Forma NOI $127,308
Price per SqFt $804
Class A
Year Built 2006
Buildings 1
Zoning CD4 — Central Business District
Parking Spaces 1 spaces
Parking per 1,000 SqFt 0.41
Investment Type Stabilized
Ownership Condo
Office | 6.5% CAP | 2,424 SqFt
Marketing description
Single-tenant Class A office condominium (2,424 SF) in downtown Portsmouth’s iconic Market Square. Suite 207 is located on the second floor of a premier mixed-use building developed in 2006, with one deeded garage parking space.
Leased to O’Brien Energy Resources Corporation under a 10-year Absolute Net lease at $127,308/year (effective April 2026), with 3% annual rent escalations compounding through 2034.
Investment highlights
6.5% cap rate with built-in 3% annual rent growth
Absolute Net lease
Premier Market Square location — walkable to 100+ restaurants, retailers, and waterfront
Class A building (2006) — elevator, structured parking, professional lobby
Deeded garage parking space included
Condo association manages all building operations
Listing Contacts
Listed by CORE
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Loan Amount
$0.00
Annual Debt Service
$--
$--
Annual Cash Flow
$123,600.00
$10,300.00/mo
Valuation Metrics
0
DSCR
6.34%
Cap Rate
6.34%
ROI
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Property History
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