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For bridging scenarios, mesh is not always a perfect fit. For this scenario, you could put a bridge in the middle building with an omnidirectional antenna connecting the other two buildings, like this:

corp bldg <----> center bldg <-----> remote bldg

This would only require three bridges with the center bldg being the multipoint location and the other two bldgs being points (i.e. a PtMP solution). For this scenario, you could use 802.11a bridges (like Cisco BR1400s) and you'd likely be able to attain a 12+mbps connection.

Alternatively, you could consider a mesh solution, especailly if you plan on expanding the wireless access to other locations or to end users. For a Cisco solution using the Mesh AP1500s, you would configure it like this:

Rooftop AP <------> Mesh AP 1 <-----> Mesh AP 2

Using .11a as your backhaul, you could expect about 6mbps throughput at MAP 2. Granted, if you are not planning on expanding this, then the mesh solution likely isn't the best choice -- it's more geared toward client access, not bridging (although you could certainly use it for that).

Joel