re: Connecting buildings with fiber

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I'd get single mode fiber as price isn't much different.

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As already mentioned, Single mode fiber may be similar price (or even cheaper) than mullti-mode fiber but the devices that will use MM will typically be cheaper (and sometimes significantly cheaper) than SM devices.

To the OP, figure out your longest run including slack in the fiber at both ends. Then find what devices you want to use on the ends of the fiber. This could be converters which would allow you to use regular ethernet port routers and switches (easily available and replaced at any time) or you could splurge for high end routers/switches with SFP ports. Make sure the equipment you pick can cover the distances required. Then buy the fiber cable that meets the requirements of those devices.

I think this is the best process to get the most affordable solution that works for you. Otherwise, you may end up with something that works but is overkill and costs more than necessary to get the job done.