Timothy Norton wrote: The devil is in the details of the contract.
And one of those details is cost - including inflation - of removal if the technology advances and the company no longer wants it. Make sure that money is set aside for that in case the company goes bankrupt which is one approach many companies take when they have a large liability and don't want to have to pay for it.
Have a look at old hydro towels that have collapsed in ice-storms to see what sort of a mess you could be left with. These things have life-spans. Friends had a typical TV tower which almost ever house had in the 70's, and it came down in a storm and luckily it didn't wreck anything important. They can be surprisingly heavy, and commercial ones will be heavier yet.