"I'm pleased to be able to move on to other things. We've spent a lot of time getting it to this point," Ms Ngatai said.
The signing of the lease was a great outcome, she said.
"We have ended up with good tenants and I think it will be a great fit for us."
Ms Ngatai said the organisation had been reluctant to take the land back but did so when receivers were unable to find a buyer. She said since then it had worked towards getting the unfinished building a code of compliance and up to standard, so it could be leased out.
Ms Ngatai said where possible it had used the contractors affected by the Grays receivership.
Te Utuhina Manaakitanga general manager Donna Blair said the alcohol and drug counselling service would move into the new facility in six months, after renovations took place. Once that happened, its current Ranolf St premises would go back into the owners' hands.
She said the service was looking forward to moving into the new facility as it would be a "quiet, new building specifically designed for what we need".
She said the residential rehabilitation unit would initially be able to take 20 patients who would stay for eight to 12 weeks, but in the long term it hoped to extend that to a capacity of 25-30.
"While the new residential (unit) is still a few months off, people concerned about their alcohol and drug use can still contact the community service in Hinemoa St for outpatient support," she said.
- Additional reporting Kyra Dawson