You could convert them to CAPWAP and use them as MESH bridges. Here is the link to the indoor MESH guide, so that you can take a look at this as an option.
IMO, if you are using them to link buildings, I might leave them IOS for the time being.
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_white_paper09186a0080b1c101.shtml
HTH,
Steve
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HTH,
Steve
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