The scheme at 100 Avebury Boulevard is set to provide the area with 140,000 sq ft of category A accommodation over eight floors in addition to retail space.
The building will feature a 10m-high reception area and large floorplates between 10,000 and 24,000 sq ft.
The scheme will also include a landscaped garden and public plaza at the front of the building.
Jon Marston, managing director at Galliford Try Building East Midlands, said: “We are delighted to be getting underway with this exciting development.
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“Our business has a strong track record in producing high-quality office accommodation within the region and we look forward to working with AW James and the stakeholders involved to create a new landmark for Milton Keynes.”
Andrew Wilson, managing director at AW James, added: “AW James are very proud of 100 Avebury’s design.
“Both our architects and Galliford Try have been putting a great deal of effort into creating a really impressive and sustainable building that will enhance the local landscape and provide plenty of opportunity for companies that are thinking about moving to a great new location that is so well connected.”