Leeds office home for Elliott Hudson college
A former Environment Agency building in south Leeds is to be refurbished as a sixth form college for 1,000 students.
Phoenix House, on the Milshaw Business Park, is to open as Elliott Hudson college in September. It has been acquired by the Gorse Academies Trust.
The college is to offer 36 A-Level subjects and has a partnership with Cambridge University, said the trust.
It is to replace the sixth form at two of the trust's existing academies in Morley and Farnley.
The trust has also established the Ruth Gorse Academy - it is to move to purpose-built premises in Hunslet in 2016.
Phoenix House was originally developed as 40,000 sq ft (3,700 sq m) of offices and laboratories for the Environment Agency. It is close to the White Rose shopping centre.
Adam Varley, of commercial property consultant LSH, said the deal was the "biggest of its kind in the city for three years".
Mark Holmes, for property company DTZ, said the move demonstrated how office buildings could "be reinvented".
"This is a trend we expect to see continue", he added.