Drain Down Sprinkler System in Empty Building?

A building owner has bought a large old warehouse and in about 6-8 months will convert it into educational spaces. They've asked if over the winter they could drain down the large wet sprinkler system as they aren't planning on heating the space or occupying the building during that time. 

I recommended against it since they'd be without protection during that entire time and a fire could result in a total loss of the building. 

I also suggested they speak with their property insurer, couldn't store anything in the building, and would need to talk with the fire department as it would be a system impairment.

Aside from that, what other barriers would they come across? What would you have recommended?

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