Accountancy firm Grant Thornton is set to move into the former NUM headquarters in Sheffield city centre.
The company says it will take all of the office space being created in the building on Holly Street, which is having a £5.5 million revamp after standing empty for 25 years.
It hopes to move all 120 staff in its current base at Broadfield Court, off Abbeydale Road, next year.
Paul Houghton, senior partner at Grant Thornton in Sheffield, said: “We’re delighted to have agreed terms to relocate to the former NUM building in the heart of Sheffield’s professional and financial services business district.
“It is an iconic building in Sheffield and the refurbishment now under way will see it transformed from its present, somewhat tired state into a key landmark within the city’s business community.”
Barnsley-based property company Quest Property has secured the long-lease of the building and the adjacent car park from the NUM, and is overseeing the redevelopment.
It was announced last month that bar chain Pitcher and Piano, owned by Marston’s, will occupy one of the three ground-floor restaurant units.
Quest is in discussions with other potential tenants.
Matthew Stephens, development director at Quest, said: “The refurbishment of this historic and iconic building in the city centre is a massive boost for the city.
“And with such a prestigious firm as Grant Thornton taking all three office floors as their regional base, we can see the city’s central business district really starting to take shape.”