Although an opening date has not yet been set, a fit-out is under way on the first floor of Alta House, at Frankton's Terrace Junction.
In an emailed statement, council corporates services director Nick Donnelly said it would have four or five staff.
As well as two part-time customer services officers, there would be staff responsible for civil defence, consents and the Orbus bus service.
Open from 8.30am to 5pm Monday to Friday, it would have have meeting facilities and "hot desks" for visiting staff to use when required, Mr Donnelly said.
Queenstown Lakes Mayor Jim Boult said it was a "very positive move".
"I think the lack of having representation here has not helped the relationship between QLDC and ORC, and has contributed to ORC not having visibility in the issues facing the district.
"So I welcome their return with open arms, and it's another sign of an improving relationship between the councils."
It would also help to clarify a lack of understanding among residents of the two councils' different responsibilities.
"With the ORC it's water and pest issues, for example, so this is a good opportunity for residents to reacquaint themselves of the responsibilities of the ORC and engage with them on appropriate matters."
The regional council's former office - in The Station building on the corner of Camp and Shotover Sts - was closed in December 2015, a few months after the death of long-time staffer Colin Walker.
The ORC justified the move at the time by saying the office had low patronage, and the only other staff, a customer services officer, had resigned.
