Updated Sep 9, 2026
John Grassi Of Spear Street Capital Acquires 400 Castro Street Office From Rob Speyer For $121.5M
400 Castro Street
$121,500,000
$880/SF
Building Size
138,000 SF
Asset Type
Office
Closing
Sep 3, 2026
About this deal
AI
400 Castro Street is a fully leased Class A office building located in downtown Mountain View, CA, encompassing 138,000 square feet. The asset was sold for $121,500,000, which translates to approximately $880 per square foot.
Summary of transaction details:
- Property Type: Office
- Transaction Amount: $121,500,000
- Buyer: John Grassi - Spear Street Capital
- Seller: Rob Speyer - Tishman Speyer
- Broker: Nate Jones - Eastdil Secured
- Market: Mountain View, CA
- Square Footage: 138,000
- Price per Square Foot: $880
Tishman Speyer developed the property in 2002 and has leased the entire space to Fenwick & West, who continues to occupy the building as the tenant following the transaction.
Players
Castor Office Market Snapshot
Boundary boundary · Office · Sale transactions
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Purchase Price
Annual NOI
Loan Amount
Interest Rate (%)
Loan Term (yrs)
Down Payment (%)
Cap Rate
0.13%
Cash-on-Cash
-0.04%
Monthly Payment
$14,164
Annual Debt Svc
$169,964
Annual Cash Flow
$-11,334
DSCR
0.93