Add Listing
    For Lease
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    Union Square Office Space Available Title is generated by Realmo AI

    251 Post Street, San Francisco, CA 94108

    View on Map
    Claim this Listing
    For Lease
    Contact for pricing

    Office space for rent in the heart of Union Square.

    Type:office.office_building
    Property size:
    6,065 SF
    Added:
    Mar 7, 2026
    Days on Market:
    91
    Last Refresh:
    Mar 7 at 7:00 pm

    Property Features for 251 Post Street

    General Information

    Standard status
    Active
    Size
    6,065 SF
    Property subtype
    office.office_building

    Building Details

    Year Built
    1908

    We can help!

    Listing Contact
    Kelly Glass
    Kelly Glass

    Listing agent Kelly Glass License #CA License No. 01335179

    Listing office Avison Young - US - CA - San Francisco

    Listing date Mar 7, 2026

    Source Avisonyoung

    Displayed information is deemed reliable but is not guaranteed and should be independently verified.

    All listing content including descriptions, pricing, images are the copyrighted material of Avison Young - US - CA - San Francisco

    HighLights

    • Great location in the heart of Union Square
    • LEED Gold Certified
    • Abundant natural light fills the space
    • Renovated lobby and restrooms
    • Easy access to public transit and garages
    • Operable windows

    Overview

    Located in the heart of Union Square, this commercial real estate offers office spaces for rent. The building is LEED Gold Certified and features a renovated lobby and restrooms. The property provides easy access to public transit and garages. Operable windows and abundant natural light are present throughout the space. The property size is 6,065 square feet.
    Location Intelligence

    Current Use by Public Records

    izmocars - Car Dealer ... (Bike/Boat/Book/etc) Store McCoy Law Firm, ... Law Firm TriNet USA, Inc. Employment Agency Meyerovich Gallery Art Gallery Community Housing Partnership ... Charitable Organization

    Suggested Use

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

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

    Location Insight

    • Map
    • Local Demand
    City
    San Francisco
    County
    San Mateo
    State
    California
    Longitude
    -122.406044
    Latitude
    37.788346

    Nearby Similar for Lease

    • $2,400/Mo
      547 SF

      Turnkey Medical Office Suite

      Professional office suite in premier medical building, Union Square.
      490 Post Street 1554, San Francisco, CA 94102
      View Details
    • $6,500/Mo
      592 SF

      Retail Storefront in San Francisco

      Newly constructed retail space with modern design and great street presence.
      1525 Franklin Street, San Francisco, CA 94109
      View Details
    • $2,500/Mo
      1,190 SF

      Prime Retail Space on Mission

      High-visibility retail space with consistent foot traffic in San Francisco.
      5654 Mission Street, San Francisco, CA 94112
      View Details
    • $3,800/Mo

      Ground-Floor Retail Storefront

      Ground-floor retail space with large display windows, restroom, and street-facing signage on a neighborhood commercial corridor.
      1226 Pacific Ave, SAN FRANCISCO, CA 94109
      View Details
    • $30 SF/Yr
      1,000 SF

      Mission District Retail Space Available

      Prime retail space in vibrant Mission District location for lease.
      3327 24th Street, San Francisco, CA 94110
      View Details
    • $39 SF/Yr
      2,000-2,100 SF

      Versatile Space on Taraval Street

      Adaptable space for medical, dental, retail use in San Francisco.
      2143-2145 Taraval St, San Francisco, CA 94112
      View Details
    • Sponsored
      $129-$7,948/Mo
      11-1,292 SF

      CA, San Francisco - 101 Montgomery

      101 Montgomery St, Unit 900, San Francisco, CA 94111
      View Details
    • $129-$235/Mo
      54-108 SF

      CA, San Francisco - 720 Market St

      720 Market St, San Francisco, CA 94210
      View Details
    • $8,000/Mo
      3,795 SF

      San Francisco Commercial Space Available

      Two-story commercial building in Lower Nob Hill for rent.
      729 Bush Street, San Francisco, CA 94108
      View Details
    • $129-$10,166/Mo
      11-1,292 SF

      Spaces Mission & 3rd

      95 3Rd St, San Francisco, CA 94103
      View Details
    • $129-$5,116/Mo
      11-1,292 SF

      Spaces Levi's Plaza

      1160 Battery St, San Francisco, CA 94111
      View Details
    • $129-$6,436/Mo
      11-1,292 SF

      California Street

      50 California St, Unit 1500, San Francisco, CA 94111
      View Details

    FAQs

    What type of property is this?
    Office building - Office space for rent in the heart of Union Square.
    Where is this office building located?
    The property is located at 251 Post Street San Francisco, CA.
    What are key features of this property?
    This property features: Great location in the heart of Union Square; LEED Gold Certified; Abundant natural light fills the space
    (415) 322-5062
    We can help!
    Listing Contact
    Kelly Glass
    Kelly Glass
    Real Estate License ID: CA License No. 01335179
    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

    Thank You for Inquiry
    251 Post Street, San Francisco, California 94108
    letter with green check mark
    Check your email
    We sent you the
    agent's contact details. yellow underline
    Can't find it?
    Please check your junk/spam folder.
    Google sign-in failed. Please try again or use another login method.
    Sign Up Successful!
    You now have access to more from Realmo!