Photo of 1 Monument Sq
Class A Office · General

1 Monument Sq

Portland, ME 04101

Available spaces

4 for lease · asking rates · updated Oct 6, 2026

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Suite Third Floor

$23.00/SF/yr MG
Size 12,670 SFAvailable Now≈ Monthly $24,284

Situated in the heart of the downtown financial and business district, One Monument Square offers stunning views of the city, Casco Bay, and Back Cove. Enjoy local restaurants such as CERA, David’s, Shay’s, Public Market House, Nura and many more. Building amenities include a pet-friendly policy, CERA restaurant/café, and brand-new gym. 2,965 – 22,435± SF of Class A office space available for lease. LEASE RATE: $23.00/SF MG

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Suite Second Floor

$23.00/SF/yr MG
Size 9,765 SFAvailable Now≈ Monthly $18,716

Situated in the heart of the downtown financial and business district, One Monument Square offers stunning views of the city, Casco Bay, and Back Cove. Enjoy local restaurants such as CERA, David’s, Shay’s, Public Market House, Nura and many more. Building amenities include a pet-friendly policy, CERA restaurant/café, and brand-new gym. 2,965 – 22,435± SF of Class A office space available for lease. LEASE RATE: $23.00/SF MG

First Floor Retail Space at 1 Monument Sq

First Floor Retail Space

$19.00/SF/yr MG
Size 1,588 SFAvailable Now≈ Monthly $2,514

1,588± SF retail space available for lease in the heart of Monument Square. Surrounded by Class A office space and multifamily, the area delivers a steady base of employees and local residents. With a Walk Score of 100, the space is located in one of Portland's most walkable districts. The building offers 24/7 security and on-site property management. LEASE RATE: $19.00/SF MG

4th Floor Suite at 1 Monument Sq

4th Floor Suite

$23.00/SF/yr MG
Size 12,670 SFAvailable Now≈ Monthly $24,284

Situated in the heart of the downtown financial and business district, One Monument Square offers stunning views of the city, Casco Bay, and Back Cove. Enjoy local restaurants such as CERA, David’s, Shay’s, Public Market House, Nura and many more. Building amenities include a pet-friendly policy, CERA restaurant/café, and a brand new gym. 2,965 – 35,105± SF of Class A office space available for lease.

The building

Building
124,658 SF · 10 floors · 1970
Site
0.35 Acres · B3 zoning
Occupancy
Multi-tenant
Submarket
Portland-South Portland

Comps

Comparable sales and lease data is available to members only.
CR
Claire Richardson · The Boulos Company
Lists 4 of 4 spaces