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851 Irwin St 27,731 SF 91% Leased Office Building San Rafael, CA 94901 $9,008,950 CAD ($324.87 CAD/SF) 8.74% Cap Rate



Investment Highlights
- 851 Irwin Street – 29,923-square-foot, three-story office building at full occupancy across 39 units and an excellent 1031 exchange candidate.
- Recent Capital Improvements – Building has undergone upgrades under current ownership, reducing near-term CapEx and providing operational stability.
- Strong Parking Ratio & Visibility – 59 on-site parking spaces (covered and surface) plus high visibility with traffic counts of over 151,000 VPD.
- Stabilized Downtown Asset – Diversified tenancy of professional offices, creative firms, and community orgs with room for escalations upon renewals.
- Prime Marin County Location – Situated in the heart of San Rafael with excellent access to Highway 101, public transit, and walkable amenities.
- Upside in Rent Growth – Market rents are trending upward in Marin County, with tenant demand largely leaning toward this building's suite sizes.
Executive Summary
851 Irwin Street has been leased to a solid mix of tenants since its 20% occupancy rate at the outset of 2024, offering a stabilized, cash-flowing asset ready for a turnkey takeover. The strong lease-up strategy has led to a scheduled NOI of $525,611 and leaves ample potential for value-add initiatives. The average monthly rate of leases here is $2.54 per square foot, compared to the San Rafael office submarket average of around $3.37 per square foot. 851 Irwin Street’s diverse roster of thriving tenants will likely be receptive to rental due to the current discounted rents, and the building’s estimated income could increase nearly 60% upon reaching market rates.
A flexible layout and recent capital improvements give 851 Irwin Street sturdy fundamentals for long-term appreciation, minimal capital expenditure costs, and strong future leasing potential. The building’s floor plan comprises small- and mid-sized offices, an optimal range for the San Rafael submarket, where the average office lease size since 2023 is approximately 1,365 square feet. After purchasing the building, the ownership group has made significant refurbishments along with its superb leasing strategy. Infrastructure upgrades include HVAC modernization, elevator improvements, roof restoration, and comprehensive security/safety enhancements. Aesthetic revisions were also made to freshen up the interior flooring, lighting, and common areas, plus a communal kitchen and conference room were added.
Direct Highway 101 exposure and access in the heart of San Rafael are some of the greatest advantages of 851 Irwin Street, attractive facets that are amplified by its rare abundance of on-site parking at 59 spaces. This is an excellent address for any office user with lifestyle-elevating amenities right at the doorstep. The building is within three blocks of essentials like Starbucks, Whole Foods, Trader Joe’s, Petco, and over a dozen restaurants, plus the San Rafael SMART rail station.
Marin County paints an optimistic outlook as its real estate indicators turn positive after the industry-wide pandemic slump, building upon its unrivaled foundation as one of the wealthiest counties nationwide and its proximity to San Francisco. Due to the density of high-income households, the Marin County real estate market comprises mostly residential assets, with commercial inventory and new development sites limited by municipality regulations, underpinning the exclusivity of 851 Irwin Street. This has put upward pressure on office rents, and the county saw a 1.4% growth rate in 2024 after remaining flat the previous two years. Additionally, much of the county’s leasing activity is concentrated along Highway 101, particularly near transit hubs, outlining 851 Irwin Street as a marquee model for success.
Property Facts
Space Availability
- Space
- Size
- Space Use
- Build-Out
- Available
Room to work. Room to grow. Suite 105 offers a polished office layout ideal for a professional services firm, established team, or any business that needs private offices without sacrificing a collaborative feel. Multiple windowed private offices line a spacious shared corridor, each wrapped in floor-to-ceiling glass fronts with sleek black frames — giving the suite a modern, executive look while keeping the energy open and connected.
Small space. Big moves. Suite 208 delivers a smart, focused workspace in the heart of San Rafael — perfectly sized for the solo practitioner, boutique firm, or growing startup that wants a real address without the overhead. A right-sized office where productivity is the only agenda.
Suite 222 is the ultimate lean office — a private, dedicated space for the solo professional who just needs a focused place to get things done. No wasted square footage, no shared desks, no distractions. Just you and your work, in the heart of San Rafael.
Compact, polished, and priced to perform — Suite 223 is a 151 SF private office tucked into one of San Rafael's most accessible business addresses. Whether you're launching solo, running lean, or need a quiet professional base away from the home office, this suite delivers a clean, focused environment without the overhead of a larger footprint.
Suite 225B is a sharp little office for the professional who knows exactly what they need — a private space with a real address in San Rafael, without paying for square footage they'll never use. Ideal for a solo practitioner, therapist, consultant, or anyone building something great one focused day at a time.
| Space | Size | Space Use | Build-Out | Available |
| 1st Fl-Ste 105 | 1,775 SF | Office | - | Now |
| 2nd Fl-Ste 208 | 374 SF | Office | - | Now |
| 2nd Fl-Ste 222 | 80 SF | Office | - | Now |
| 2nd Fl-Ste 223 | 151 SF | Office | - | Now |
| 2nd Fl-Ste 225B | 132 SF | Office | - | Now |
1st Fl-Ste 105
| Size |
| 1,775 SF |
| Space Use |
| Office |
| Build-Out |
| - |
| Available |
| Now |
2nd Fl-Ste 208
| Size |
| 374 SF |
| Space Use |
| Office |
| Build-Out |
| - |
| Available |
| Now |
2nd Fl-Ste 222
| Size |
| 80 SF |
| Space Use |
| Office |
| Build-Out |
| - |
| Available |
| Now |
2nd Fl-Ste 223
| Size |
| 151 SF |
| Space Use |
| Office |
| Build-Out |
| - |
| Available |
| Now |
2nd Fl-Ste 225B
| Size |
| 132 SF |
| Space Use |
| Office |
| Build-Out |
| - |
| Available |
| Now |
1st Fl-Ste 105
| Size | 1,775 SF |
| Space Use | Office |
| Build-Out | - |
| Available | Now |
Room to work. Room to grow. Suite 105 offers a polished office layout ideal for a professional services firm, established team, or any business that needs private offices without sacrificing a collaborative feel. Multiple windowed private offices line a spacious shared corridor, each wrapped in floor-to-ceiling glass fronts with sleek black frames — giving the suite a modern, executive look while keeping the energy open and connected.
2nd Fl-Ste 208
| Size | 374 SF |
| Space Use | Office |
| Build-Out | - |
| Available | Now |
Small space. Big moves. Suite 208 delivers a smart, focused workspace in the heart of San Rafael — perfectly sized for the solo practitioner, boutique firm, or growing startup that wants a real address without the overhead. A right-sized office where productivity is the only agenda.
2nd Fl-Ste 222
| Size | 80 SF |
| Space Use | Office |
| Build-Out | - |
| Available | Now |
Suite 222 is the ultimate lean office — a private, dedicated space for the solo professional who just needs a focused place to get things done. No wasted square footage, no shared desks, no distractions. Just you and your work, in the heart of San Rafael.
2nd Fl-Ste 223
| Size | 151 SF |
| Space Use | Office |
| Build-Out | - |
| Available | Now |
Compact, polished, and priced to perform — Suite 223 is a 151 SF private office tucked into one of San Rafael's most accessible business addresses. Whether you're launching solo, running lean, or need a quiet professional base away from the home office, this suite delivers a clean, focused environment without the overhead of a larger footprint.
2nd Fl-Ste 225B
| Size | 132 SF |
| Space Use | Office |
| Build-Out | - |
| Available | Now |
Suite 225B is a sharp little office for the professional who knows exactly what they need — a private space with a real address in San Rafael, without paying for square footage they'll never use. Ideal for a solo practitioner, therapist, consultant, or anyone building something great one focused day at a time.
Property Taxes
| Parcel Number | 014-125-15 | Improvements Assessment | $3,760,736 CAD |
| Land Assessment | $1,012,506 CAD | Total Assessment | $4,773,242 CAD |
Property Taxes
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851 Irwin St
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