A spokesman for the RPA said their priority will be to talk directly with all those affected to listen to "their preferences and understand their individual circumstances."
"We appreciate the decision to leave Alverton Court is disappointing to many of our people.
"However, we will do everything possible to ensure a smooth transition for everyone and would stress that this is not about job losses and that we will continue to deliver the same level of service to our customers.
"This decision has not been made lightly and we are working hard to provide as much clarity and certainty to those impacted. All our people who are prepared to work flexibly have been guaranteed a job and all posts will remain in the region."
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It's been confirmed that the Marks and Spencer stores in both Stockton and Darlington will close in August.
It's part of the investigation into the disappearance of Donna Keogh from Middlesbrough in 1998 when she was just 17 years old.
The move is likely to lead to the loss of more than 1,500 jobs.