18 Congress Street
Multi-Family18 Congress Street, Portsmouth, NH 03801
- Type
- Sale
- Status
- Active
- Asking Price
- $1,950,000
- Cap Rate
- 6.53%
- List Date
- Mar 11, 2026
- Days on Market
- 111
- Sale Investment
- NNN
- Sale NOI
- $127,308
- Sale Gross Income
- $127,308
- Owner Occupied
- No
- Last Verified
- May 26, 2026
Portsmouth Office Condo Investment
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
Space Details
- Floor
- 2
- Suite
- Suite 207
- Available SF
- 2,424 SF
- Primary Use
- Office
- Type
- Multi-Family
- Subtype
- Mixed use
- Size
- 32,955 SF
- Acreage
- 0.33 Acres
- Occupancy Type
- Multi Tenant
- Floors
- 4
- Construction
- Masonry
- Zoning
- CD5
- County
- Rockingham
- Submarket
- Boston-Cambridge-Newton
- Type
- Sale
- Status
- Active
- Asking Price
- $1,950,000
- Cap Rate
- 6.53%
- List Date
- Mar 11, 2026
- Days on Market
- 111
- Sale Investment
- NNN
- Sale NOI
- $127,308
- Sale Gross Income
- $127,308
- Owner Occupied
- No
- Last Verified
- May 26, 2026
Portsmouth Office Condo Investment
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
Space Details
- Floor
- 2
- Suite
- Suite 207
- Available SF
- 2,424 SF
- Primary Use
- Office
- Type
- Multi-Family
- Subtype
- Mixed use
- Size
- 32,955 SF
- Acreage
- 0.33 Acres
- Occupancy Type
- Multi Tenant
- Floors
- 4
- Construction
- Masonry
- Zoning
- CD5
- County
- Rockingham
- Submarket
- Boston-Cambridge-Newton