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100 Borthwick Ave 2,084 - 18,098 SF of Office Space Available in Portsmouth, NH 03801

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Highlights

  • Ample on-site parking
  • Generous Tenant Improvement Allowance of $75.00/SF!
  • Excellent visibility and signage potential

All Available Spaces(5)

Display Rental Rate as

  • Space
  • Size
  • Term
  • Rental Rate
  • Space Use
  • Condition
  • Available
  • 1st Floor, Ste 110
  • 2,084 SF
  • Negotiable
  • $38.20 CAD/SF/YR $3.18 CAD/SF/MO $79,616 CAD/YR $6,635 CAD/MO
  • Office
  • -
  • Now
  • Lease rate does not include utilities, property expenses or building services
  • 1st Floor, Ste 120
  • 3,526 SF
  • Negotiable
  • $38.20 CAD/SF/YR $3.18 CAD/SF/MO $134,705 CAD/YR $11,225 CAD/MO
  • Office
  • -
  • Now
  • Lease rate does not include utilities, property expenses or building services
  • 1st Floor, Ste 140 & 150
  • 3,322-7,433 SF
  • Negotiable
  • $38.20 CAD/SF/YR $3.18 CAD/SF/MO $283,966 CAD/YR $23,664 CAD/MO
  • Office
  • -
  • Now
  • Lease rate does not include utilities, property expenses or building services
  • 1st Floor, Ste 160
  • 2,840 SF
  • Negotiable
  • $38.20 CAD/SF/YR $3.18 CAD/SF/MO $108,498 CAD/YR $9,041 CAD/MO
  • Office
  • -
  • Now
  • Lease rate does not include utilities, property expenses or building services
  • 2nd Floor, Ste 250
  • 2,215 SF
  • Negotiable
  • $38.20 CAD/SF/YR $3.18 CAD/SF/MO $84,621 CAD/YR $7,052 CAD/MO
  • Office
  • -
  • Now
  • Lease rate does not include utilities, property expenses or building services
Space Size Term Rental Rate Space Use Condition Available
1st Floor, Ste 110 2,084 SF Negotiable $38.20 CAD/SF/YR $3.18 CAD/SF/MO $79,616 CAD/YR $6,635 CAD/MO Office - Now
1st Floor, Ste 120 3,526 SF Negotiable $38.20 CAD/SF/YR $3.18 CAD/SF/MO $134,705 CAD/YR $11,225 CAD/MO Office - Now
1st Floor, Ste 140 & 150 3,322-7,433 SF Negotiable $38.20 CAD/SF/YR $3.18 CAD/SF/MO $283,966 CAD/YR $23,664 CAD/MO Office - Now
1st Floor, Ste 160 2,840 SF Negotiable $38.20 CAD/SF/YR $3.18 CAD/SF/MO $108,498 CAD/YR $9,041 CAD/MO Office - Now
2nd Floor, Ste 250 2,215 SF Negotiable $38.20 CAD/SF/YR $3.18 CAD/SF/MO $84,621 CAD/YR $7,052 CAD/MO Office - Now

1st Floor, Ste 110

Size
2,084 SF
Term
Negotiable
Rental Rate
$38.20 CAD/SF/YR $3.18 CAD/SF/MO $79,616 CAD/YR $6,635 CAD/MO
Space Use
Office
Condition
-
Available
Now

1st Floor, Ste 120

Size
3,526 SF
Term
Negotiable
Rental Rate
$38.20 CAD/SF/YR $3.18 CAD/SF/MO $134,705 CAD/YR $11,225 CAD/MO
Space Use
Office
Condition
-
Available
Now

1st Floor, Ste 140 & 150

Size
3,322-7,433 SF
Term
Negotiable
Rental Rate
$38.20 CAD/SF/YR $3.18 CAD/SF/MO $283,966 CAD/YR $23,664 CAD/MO
Space Use
Office
Condition
-
Available
Now

1st Floor, Ste 160

Size
2,840 SF
Term
Negotiable
Rental Rate
$38.20 CAD/SF/YR $3.18 CAD/SF/MO $108,498 CAD/YR $9,041 CAD/MO
Space Use
Office
Condition
-
Available
Now

2nd Floor, Ste 250

Size
2,215 SF
Term
Negotiable
Rental Rate
$38.20 CAD/SF/YR $3.18 CAD/SF/MO $84,621 CAD/YR $7,052 CAD/MO
Space Use
Office
Condition
-
Available
Now

1st Floor, Ste 110

Size 2,084 SF
Term Negotiable
Rental Rate $38.20 CAD/SF/YR
Space Use Office
Condition -
Available Now

  • Lease rate does not include utilities, property expenses or building services

1st Floor, Ste 120

Size 3,526 SF
Term Negotiable
Rental Rate $38.20 CAD/SF/YR
Space Use Office
Condition -
Available Now

  • Lease rate does not include utilities, property expenses or building services

1st Floor, Ste 140 & 150

Size 3,322-7,433 SF
Term Negotiable
Rental Rate $38.20 CAD/SF/YR
Space Use Office
Condition -
Available Now

  • Lease rate does not include utilities, property expenses or building services

1st Floor, Ste 160

Size 2,840 SF
Term Negotiable
Rental Rate $38.20 CAD/SF/YR
Space Use Office
Condition -
Available Now

  • Lease rate does not include utilities, property expenses or building services

2nd Floor, Ste 250

Size 2,215 SF
Term Negotiable
Rental Rate $38.20 CAD/SF/YR
Space Use Office
Condition -
Available Now

  • Lease rate does not include utilities, property expenses or building services

Property Overview

Quality office spaces ranging from 2,215± SF to 7,433± SF, offering flexible layouts that include private offices, open collaborative areas, conference rooms, and kitchenettes. Join a thriving professional corridor—neighboring tenants include Portsmouth Regional Hospital, Liberty Mutual, Highliner Foods, and a variety of medical users. Conveniently located directly off US Route 1 and Exit 3 of I-95.

  • Banking
  • Signage

Property Facts

Building Type
Office
Year Built/Renovated
1978/2005
Building Height
3 Stories
Building Size
47,745 SF
Building Class
B
Typical Floor Size
16,014 SF
Parking
Surface Parking
  • Listing ID: 33377168

  • Date on Market: 2026-02-25

  • Last Updated:

  • Address: 100 Borthwick Ave, Portsmouth, NH 03801

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