Global energy company Gazprom Energy is understood to have signed a pre-let for around 40,000 sq ft within a 157,000 sq ft building at Ask Development's First Street site in Manchester.
Gazprom has agreed to take the fifth and six floors of the block, with a source close to the deal confirming that the company also has an option to take a further 11,500 sq ft.
The space has been taken on a 15-year lease.
The total building will offer 157,000 sq ft of offices over six upper floors with a further 14,000 sq ft of ground floor retail and leisure space.
Construction on the site next to Number One First Street is expected to commence in October 2015 with completion in March 2017.
Gazprom is an energy company which focuses on the extraction of natural gas. The firm currently occupies 18,000 sq ft within BlackRock's Bauhaus office in Quay Street, Manchester.
The Gazprom deal is the latest in a series of large office lettings in Manchester, with UK Visas & Immigration understood to have signed for 50,000 sq ft within the Carlyle Group's 400,000 sq ft Soapworks scheme in Salford Quays last week.
CBRE and Savills are joint agents for Ask. CBRE advised Gazprom.
All parties declined or were unavailable to comment.