Around 400 jobs are expected to be created with the arrival of a £10m office development in Port Talbot.
A health club, nursery, conference centre and office suites are earmarked for the development at Baglan Energy Park.
Developers TCN say it is hoped part of the building will be taken by Neath Port Talbot Council and the Welsh Assembly.
It is the company's first major development in Wales.
The site has already generated employment for more than 1,600 people and seen £400m worth of investment.
According to TCN, it has been impressed by regeneration in the area and success achieved in both Cardiff and Swansea.
It says it has virtually let all the space in the building.
The development, which will be 60,000 square ft in size, will be formally announced on Tuesday at the park.
Derek Vaughan, leader of Neath Port Talbot Council said: "I am delighted that Baglan Energy Park is bucking the economic trend and still attracting business and jobs to the area.
"Of course this builds on our recent success in places like Amazon where we attracted 1,300 jobs."
Dr Dai Lloyd, assembly member, said: "It's tremendous news, you can't argue with the figures with regards to the new development at Baglan Energy Park.
"It builds on the success of the SA1 development next door - round the corner - in Swansea, and obviously the Amazon development."
Cllr Vaughan said he understood the ground floor will have some conference facilities, a gym and a cafe.
He added: "On the first and second floors there will be office accommodation. Of course the developer is now looking at attracting businesses into these offices and they tell me they are confident of filling these offices and getting 400 jobs into there."
The development will share the site with Italian firm Intertissue Ltd which came to the park in 2003 and created 300 jobs.
Japanese company Hi-Lex Cables Systems, which makes parts for the automotive industry, is also on the site.