Roof Top Cell Tower buyout offer (Questions/concerns...)

[Scott Russell]

I recently was approached by a company who wants to buyout my rooftop cell tower lease. After getting approached by 1 company I reached out to a couple others to see what the lease was valued at for other offers. I am always offered a lump sum, revenue share %, and an easement term (usually about 50 years).  The lease: Initial term of 5 years with 5 renewals of 5 years each term. 

Questions:

1) Why a 50 year easement when the lease is for 25 years? why do they want such a long term easement/lease? (some easements are for 99 years)

2) The easement should be for a portion of the roof and not the whole roof top?

3) If I sell the rooftop lease and they have an easement for 50 years would this hurt the value/resale of the property? (knowing the new owner wont get any money)

4) Are there any other terms I should consider when selling the rooftop?