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550 7th Street

Updated Oct 15, 2025

Astro Mechanica Leases 21,500-SF Office Building At 550 7th Street San Francisco
LEASEDOffice

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

Ian Brooke

Astro Mechanica

Tenant

1 deal

Tenant
Astro Mechanica
Astro MechanicaTenant

San Francisco Office Market Snapshot

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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

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