Dear Sir or Madam:
I refer to the document(s) received detailing your revised proposal for….
Insert itemized list of proposals, referring to each proposal, with your decision expressed as Agreed or Not Agreed.
It appears that we can now proceed to a formal arrangement. Please contact me at your earliest convenience to arrange details.
Alternative final clause, where some issues are unresolved:
It appears that we are now very close to finalizing a formal arrangement. Please contact me at your earliest convenience to arrange discussion of the outstanding matters.