The full-service chartered surveyors, which also has offices in Luton and Bedford, has also unveiled new branding and website to coincide with the move from Meridian House, in North Twelfth Street.
Its new headquarters is at Shenley Pavilions, a 4,000 sq ft self-contained pavilion unit which provides open-plan office space for staff all on one floor.
Managing partner Andrew Wright said: "The past few years have been extremely positive for Kirkby Diamond, thanks to our team of highly experienced chartered surveyors and a booming commercial property market.
"That has put us in an excellent position to build on our successes and plan the expansion of our Milton Keynes office. Like the ambitious, growing companies that we assist on a day-to-day basis, we have been looking for the right premises that will enable us to expand further."
The firm also plans to recruit more property professionals to join the company as it takes advantage of the booming commercial property sector.
The move comes after after operating for more than 20 years from the same town centre offices.
Mr Wright said: "It seemed appropriate to celebrate this new chapter in our story with fresh, new branding that reflects our modern, confident approach to commercial property."
- Pictured: Kirkby Diamond partners Andrew Wright (left), Eamon Kennedy, and Jean Howe outside the new office.