Tenant wants to sublease during travel assignment

[Mark Sandlin]

Current tenant wants to take on a travel nursing assignment in FL for ~3 months in December. He's been in for about 4 months on an 18mo lease. He is wanting to leave all his furniture in the house and is asking if someone can stay there while he's gone to mitigate his costs. I see potential risks with his stuff breaking / being stolen if we found a suitable mid-term renter, if we even can (short term airbnb laws do not allow under 30 day stays in the city unless permitted). Has anyone dealt with this request or foresee other risks that might make "no" a better answer? If so, is there a good way to word this? Trying to consider this with an open mind but it seems sticky. 

[Nathan Gesner]

I don't allow subleasing. I also don't allow tenants to sign 18 month leases because I know the vast majority of them have no stability and I'm more likely to break it early.

He likely signed this 18 month lease knowing he would not be sticking around. I would charge the tenant a termination fee and end their lease early.