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The Oversize Airship Support Bay is a Monkey vs. Monkey building in Bloons Monkey City and Bloons Monkey City Mobile. Upon building, it allows the player to research B.F.B.s, allowing the player to send B.F.B.s in attacks. The building costs $80,000 and 55, takes up 4 land tiles (2x2), takes two days to build, and it gives the player 800 XP. It is availabe at City level 22 and up.
- The B.F.B. on the building does not have the anti-monkeys sign and the eye symbols .