Rent paid up for 6 months?

[Mike Provencher]

I have a prospective tenant who says they are building a home and would like to pay me 6 months rent up front.

I have heard (through BP podcasts) that I should be cautious about doing so.  

If he is building a home, I could see how he would want to only go for 6 months...but, that means I have turning costs again in 6 months, so provided his credit and references check out...I may do it.  But I would think he would have to pay a premium for that privilege...was thinking 2 months extra rent.  

Any ideas, thoughts, caveats, straight up warnings? 

Thanks, 
Mike