This will depend partly on the size and layout of the building, but you'll want a minimum of three access points -- one for each organization. Set the APs to channels 1, 6 and 11 so that each has it's own and interference won't be an issue. If coverage for the folks spanning two floors is insufficient, you can add a fourth AP set to the same channel as the client on the first floor, opposite side.
Having access points in range of each other on the same channel can lead to collisions and interference, and can result in dramatic drops in range and/or throughput.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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