Updated Oct 15, 2025
Astro Mechanica Leases 21,500-SF Office Building At 550 7th Street San Francisco
550 7th Street
Building Size
21,500 SF
Asset Type
Office
Closing
Sep 22, 2025
About this deal
AI
The property involved in this lease transaction is an office asset located at 550 7th Street, San Francisco. The total size of the leased space is 21,500 square feet, with a specific market focus on San Francisco. Astro Mechanica, an aerospace startup, upgraded from its previous 4,000-square-foot office to occupy the entire building.
Summary of transaction details:
- Property Type: Office
- Transaction Amount: Not specified
- Address: 550 7th Street
- Market: San Francisco
- Size: 21,500 square feet
- Tenant: Ian Brooke - Astro Mechanica
- Investment: $27.1M raised plus additional investment from United Airlines’ venture arm
Ian Brooke is the representative for Astro Mechanica in this transaction. The company was founded in 2021 and is focused on developing a jet engine for commercial supersonic flights, indicating a significant advancement in aerospace technology.
Players
San Francisco Office Market Snapshot
Boundary boundary · Office · Lease transactions
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Purchase Price
Annual NOI
Loan Amount
Interest Rate (%)
Loan Term (yrs)
Down Payment (%)
Cap Rate
5.80%
Cash-on-Cash
-1.66%
Monthly Payment
$14,164
Annual Debt Svc
$169,964
Annual Cash Flow
$-11,334
DSCR
0.93