Ambac Financial Group, Inc. and Ambac Assurance Corp. will reopen their headquarters at One State Street Plaza in New York City on Monday, Nov 26.

The offices were closed as a result of damage from Superstorm Sandy.

As a result of storm damage, the companies’ telephone system will not be fully operational. A temporary system is available for inbound calls, and inquiries may be directed to (845) 810-3000 or through regular e-mail channels.

Ambac will be closed from Nov. 21 through Nov. 23 to facilitate the migration of its systems and operations back to the New York City headquarters from the disaster recovery site in Kingston, N.Y.