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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Robert Hodgson, from Stanley, County Durham, committed the offences on the girls, aged as young as five or six, up to the age of 13.