Add Listing
    For Lease
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    AI Search
    Back to Search
    The Largest CRE Database in the US with Over 1 Million Listings

    400 Congress St Unit 300 Portland, ME 4101

    View on Map
    Sponsored
    For Lease
    Contact for pricing

    Discover many ways to work your way in ME, Portland - Congress

    Property size:
    10 SF - 1,292 SF
    Added:
    Feb 19, 2026
    Days on Market:
    40
    Last Refresh:
    Mar 16 at 9:06 am

    Property Features for 400 Congress St Unit 300

    General Information

    Standard status
    Active
    Property type
    Office properties & Spaces, Coworking space, Flex space, Specialty properties
    Size
    10 SF - 1,292 SF
    Rate Type
    Monthly

    Amenities

    24 Hour Access
    Air Conditioning
    Breakroom
    Business Center
    Close to Public Transportation
    Conference Rooms
    Controlled Access
    Elevator
    Fiber Optic Internet
    Furnished Units Available
    Internet
    Lounge
    Meeting Event Space
    On-Site Security Staff
    Online Services
    Package Service
    Reception
    Recycling
    Storage Space
    Wheelchair Accessible
    Wi-Fi

    Spaces For Lease

    at 400 Congress St Unit 300 Contact us

    Office for 1 $499 /Mo

    Size
    86-538 SF
    Type
    Office
    Focus on driving your business forward with a professional office just for you and...
    show more
    Contact us

    Office for 2 $819 /Mo

    Size
    108-538 SF
    Type
    Office
    Get started right away with a ready-to-use office space for two. Regus’ small offices...
    show more
    Contact us

    Office for 3 $989 /Mo

    Size
    162-646 SF
    Type
    Office
    Productive workspace for three that comes with everything taken care of. Regus’...
    show more
    Contact us

    Office for 4 $1,488 /Mo

    Size
    215-646 SF
    Type
    Office
    Book a fully serviced office for four, and Regus will make sure everything always...
    show more
    Contact us

    Office for 5 $1,808 /Mo

    Size
    323-807 SF
    Type
    Office
    Access a bright and inspiring office space designed to help teams of five to do their...
    show more
    Contact us

    Membership CW $129 /Mo

    Size
    54-108 SF
    Type
    Office
    Work wherever and however you need to with a Regus Coworking membership. Regus offers...
    show more
    Contact us

    Membership office $235 /Mo

    Size
    86-108 SF
    Type
    Office
    Work wherever and however you need to with a Regus Office membership. Regus offers...
    show more
    Contact us

    Coworking $309 /Mo

    Size
    108-328 SF
    Type
    Office
    Get to work among a like-minded community in Regus’ shared office space. Regus’...
    show more
    Contact us

    Office for +10 $3,466 /Mo

    Size
    484-1184 SF
    Type
    Office
    Find a flexible choice for business with an open-plan office space that supports...
    show more
    Contact us

    Office for +15 $5,646 /Mo

    Size
    1076-1292 SF
    Type
    Office
    Open plan office space for 15 persons available on flexible terms, so you can add...
    show more
    Contact us

    Virtual office $195 /Mo

    Size
    10-50 SF
    Type
    Office
    Build your business presence fast, with an instant professional company address and...
    show more
    Contact us
    Show more

    We can help!

    Listing Contact
    Regus USA
    Regus USA

    Listing agent Regus

    Listing office

    Listing date Feb 19, 2026

    Location Intelligence

    Current Use by Public Records

    Social Security Administration Social Security Office United States Postal ... Money Order Service Travel Visa Pro Travel Agency Maine Executive Search Corporate Office Help ME Handyman ... Hardware & Home Improvement

    Suggested Use

    Real Estate Agency Dental Office Restaurant Spa & Massage Center Hair Salon Nail Salon Building Supply Law Firm Daycare Center Auto Repair Shop

    Zoning and permitted uses should be independently verified with local authorities.

    Similar Places Nearby

    • tkc.io — 158 Danforth St, Portland, ME 04102
    • J.D. Polcek — 53 Danforth St Apt. #3C, Portland, ME 04101
    • Kindly Ops LLC — 30 Danforth St #214, Portland, ME 04101
    • Visual Edge IT New England | Portland — 565 Congress St Unit 308, Portland, ME 04101
    • uBreakiFix - Phone and Computer Repair — 614 Congress St, Portland, ME 04101

    Location Insight

    • Map
    • Local Demand
    City
    Portland
    County
    Cumberland
    State
    Maine
    Longitude
    -70.2571446
    Latitude
    43.6586615

    Nearby Similar for Lease

    • Contact for pricing

      ME, Portland - Hutchins Dr

      41 1St St, Unit 3, Portland, ME 04102
      View Details
    • $24/mo

      Downtown Portland Office Space Available

      Full floor office suites for lease in Portland's financial district.
      48 Free St, Portland, ME
      View Details
    • Contact for pricing

      Renovated Waterfront Office with Harbor Views

      Historic Class A office space with exposed beams and brick.
      254 Commercial St, Portland, ME
      View Details
    • $16/mo

      Historic Restaurant Space in Old Port

      Renovated restaurant space with patio in the Old Port.
      2-10 Cotton St, Portland, ME
      View Details
    • $26/mo

      Iconic Old Port Retail Space

      Prime retail location in the heart of Portland's waterfront district.
      373 Fore St, Portland, ME
      View Details
    • $30/mo

      Historic Office Space For Rent

      2,800 SF office space in historic Roundhouse complex.
      125 Presumpscot St, Portland, ME
      View Details
    • $18/mo

      Portland Flex/Service Space for Lease

      3,288± SF flex/service space in Portland's East Bayside District.
      31 Diamond St, Portland, ME
      View Details
    • Contact for pricing

      Financial District Office Space

      Office suites available in the Financial District.
      1 Monument Way, Portland, ME
      View Details
    • $18/mo

      Portland Retail/Office Space For Sale

      Retail and office spaces available in Portland, Maine.
      550 Washington Ave, Portland, ME
      View Details
    • $23/mo

      Fore Street Office Space Available

      Office space for lease in vibrant Portland waterfront area.
      167 Fore St, Portland, ME
      View Details
    • Contact for pricing

      Bayside Office Suite For Rent

      Office suite in Bayside with convenient access and parking.
      175 Lancaster St, Portland, ME
      View Details
    • Contact for pricing

      Turnkey Dental Suite For Lease

      Turnkey dental suite with furniture, fixtures, and equipment in place.
      94 Washington Ave, Portland, ME
      View Details

    FAQs

    What type of property is this?
    Office property - Discover many ways to work your way in ME, Portland - Congress
    Where is this office property located?
    The property is located at 400 Congress St Unit 300 Portland, ME.
    What are key features of this property?
    This property features: Be part of a vibrant coworking community with dedicated desk or hot desking options in thousands of idyllic locations across the globe; Grow in a modern workplace with the added advantage of a benefits program offering exclusive discounts and bespoke procurement support; Access Regus' network of workspaces and business lounges as often as you need and take advantage of their exclusive benefits
    (972) 764-8885
    We can help!
    Listing Contact
    Regus USA
    Regus USA
    Learn More
    Request Owner's contact information
    Message sent successfully
    Error
    If you are the owner or broker of this property and would like to edit or remove this listing please send a message to web site administrator.
    Message sent successfully
    Error
    Email to Your Friends
    Link copied to clipboard
    Separate multiple addresses with a comma
    Message sent successfully
    Error

    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
    Thanks! Your message was sent.
    Error! Your message wasn't sent.
    Please enter your name
    Please enter email
    Please enter the email in the correct format
    Please enter phone
    Please enter the number in the correct format
    Please enter message
    Thank You

    You are Unsubscribed From Notifications

    Google sign-in failed. Please try again or use another login method.
    Sign Up Successful!
    You now have access to more from Realmo!