The clothing chain New Look is making a new investment in Dorset, two years after closing its distribution centre and laying off 500 workers.
The investment is expected to create about 1,000 new jobs but none will be employed by the high street company.
New Look applied to build a new headquarters in Weymouth. The council agreed to the plan as long as it is part of a larger development.
The plans include a business centre that will provide the additional jobs.
The company has also agreed to pay £140,000 towards the construction of a relief road to link the existing roadnetwork with the development.
In 2005, New Look transferred its distribution operation to the Midlands but kept its 443 head office staff in Weymouth.
Company spokesman Robin Lewis told the BBC that the distribution "epicentre" remains in the Midlands and this latest development on Mercery Road was not a question of New Look "moving back" to Weymouth.
"This is a completely different issue," he said.