The basement of the Riverside Centre offices has been flooded, with access to the complex expected to be limited for a number of days.

Allens Arthur Robinson has opened new offices located at the Sofitel Hotel Brisbane Central and the Dockside Convention Centre.

"These offices are now up and running, which means we can continue to support our clients in the usual way," said Brisbane-based partner Erin Feros.

In addition to establishing temporary office space, a small number of Blake Dawson's legal and support staff have also been relocated to Sydney and Melbourne so that the firm can continue to provide its full service offerings to clients.

"Our Queensland team is to be congratulated for maintaining its commitment to delivering high quality service to our clients at all times, notwithstanding the difficult and unprecedented conditions," said Blake Dawson deputy managing partner Helen McKenzie.

Although both firms have reported that all staff are safe, Blake Dawson is providing a special flood relief support package to affected employees and Allens has put in place counselling services, hotlines, SMS update services and compassionate leave policies.

"As the recovery process progresses we'll be sitting down to discuss how we can continue to assist the rebuilding effort through fundraising, volunteering and pro bono work," Feros said.