Their building and other parts of the hospital grounds are subject to a Treaty claim.
"Bricks and mortar will follow once we look at our services," said Mr Cocks.
"We're not jumping ship; we want to solidify what we are doing here.
"It's a great opportunity to try different things, and we have got the space to do it."
Mr Cocks said they now had specialist nursing clinics on site.
They were in discussion to get medical laboratory services, physiotherapy, and a pharmacy.
The centre's more distant placement, at the rear of the hospital, was harder for patients, but the St John ambulance shuttle, with a fixed loop around town, was starting to grow in usage, said Mr Cocks.
The centre's board chairman, Bob Francis, said February's fire was a "major blow" but the long-term future was extremely positive.
"We are now on a single site, staff are feeling happy and confident about the future.
"It was quite traumatic, but the outcome has been superb."
Wairarapa District Health Board chairman Derek Milne said Masterton Medical had the opportunity to become a "centre of excellence".