Scottish Borders Council has agreed to seek assurances over the future use of the main post office in Galashiels when its services move to a W H Smith store.
Mr Parker said he hoped a use could be found for the building
It is one of 11 sites nationwide where such switches are planned.
The Post Office has said the move might be the only way to retain its services in some towns.
Borders Council leader David Parker said the authority wanted to ensure the prominent building did not sit empty after the transfer.
Consultation is already under way over the Galashiels plans.
The Post Office hopes to complete all the transfers by autumn 2008.
Mr Parker said it was important that the post office building did not lie empty.
"It is a very significant building in Galashiels and we have to lay down a marker that the building does need to be reutilised," he said.
"I think it is important to make it quite clear to the Post Office now that we have concerns about that and we want them to put plans in place.
"I am sure they will be doing that and we will be having discussions about that building in the months going forward."