Yes, you definitely need the state permit transfer form. No, you don’t have to re-type the lease and have it signed by all parties. Instead, you’ll need what is called an “Assignment of Lease” document that transfers your rights under the lease to the new owner. You normally always draw the site plan yourself – except in the rare case where the city requires something more professional. I have only had to include a surveyor a couple times in hundreds of leases, and it was in cases where there was confusion on where the actual highway right-of-way extended to.
When you flip a lease, you normally don’t tell the landowner your intentions. You go to them after the fact and tell them that there is the potential of a “win/win” with their location, in that a bigger company wants to take over the lease and build a more expensive structure than you can afford to build, and will be able to rent it for more money and be more financially strong. Normally, most owners would much rather have a large company for a tenant than a tiny one. That’s not to say that all owners are happy with the concept – some feel they’ve been cheated. But I’ve never had a serious problem over it. Make sure that your lease contains the correct language in Delaware to be assignable, however. Tell the owner what you’re doing before you sign the final papers to sell it, just in case he is so upset that you decide it it just better to keep it or drop it.
I’m sorry to say that I do not have any knowledge of the sign laws in Delaware. My guess is that a “record plan” is like a legal description of the real estate itself.