Images of the items stolen in the robbery have also been released.
At 12.40pm on Monday 22 July, the victim, a 33-year-old woman, was walking into the Vizion apartments building, on South Fifth Street, near Witan Gate when she was followed inside by an offender.
The victim entered a lift at the bottom of the building, and was followed by the offender who then threatened her with a knife, before punching and kicking her.
During the assault, the offender took a watch and half of a gold necklace which was broken during the incident.
The offender then fled on foot from the apartment building, across Avebury Boulevard in the direction of Pizza Express. He then turned left heading in the direction of Turtle Bay.
The victim sustained cuts and red marks to her face and chest. She was taken to Milton Keynes University Hospital and has since been discharged.
Designated Investigator Charles Cox, of Milton Keynes police station, said: “We are releasing this CCTV image of a man who may have vital information regarding this incident.
“We are also releasing images of the items that were taken during this robbery as part of the appeal to try and get them back to the owner.
“This was a terrifying experience for the victim, who was assaulted and then had personal items taken from her.
“I would appeal for anyone who witnessed the incident, or believes they recognise the man depicted in the images to get in touch with police.
“If you have any information relating to this incident, please call 101 quoting 43190224012.