That's what a tipster claims over at Breathing Is Political:
I had a customer inform me two days ago that the home equity loan they were obtaining in order to purchase a small investment piece near them was turned down by GMAC because their home property was under a gas lease. I dug a little further and found through mortgage brokers that that they are encountering the same reluctance on the part of some local and some bigger banks to lend on leased properties. I hope those who have signed leases have figured this into the equation. A similar example would be as in the case of Flood Zone properties for whom the Flood Insurance program was withdrawn, banks would also not lend on those. In the real estate world, things like this are a huge consideration in factoring property values. Just thought some people might not be aware of this trend by lenders.
In the comments, realtor Jennifer Canfield names lenders she says are not lending on properties with gas leases:
First Place Bank
Wells Fargo (will know for sure in a few days)
Bank of America