Dealing with Agent for post-rehab estimate?

[Kevin NA]

Hi.  I have a potential deal in NW Philadelphia.  To complete the deal I need to estimate the value (rent and sale) of a property post-rehab.  An appraiser will not be able to estimate an unfinished property.  The deal is with a turn key developer and I would have no need for an agent other than the re-selling, which may be years down the road.   Would an agent be willing to work with me on this even though I dont have a potential commission to offer?  Should I offer hourly pay? Should I try to work them into the deal?

I want an estimate I can trust so I want to be forthcoming and try to compensate the agent as fairly as possible.

Thanks!