An 38,500 square foot Premier Inn and Beefeater in Riverside Way have created 68 new jobs.
Uxbridge and South Ruislip MP Mr Johnson and Gary Poulton, who reached the final five in the BBC One hit show's last series, attended the opening ceremony on Friday.
Mr Poulton now works for Whitbread, which was involved with the scheme along with Real Estate Investment Trust SEGRO, Hillingdon Borough Council, Uxbridge College and Job Centre Plus.
Mr Johnson said: “I am very much aware of the work of Hillingdon Council in attracting quality businesses to the local area with job opportunities for local people.
“I have seen first-hand at Uxbridge College how working with developers, like SEGRO, on local projects is helping with skills training and I am delighted to have the opportunity to meet with all the partners involved in this initiative.”
The completion of the site took 36 months, from initial conversations to new customers moving in.
During the course of construction, SEGRO and McLaren Construction, the site contractor provided 57 construction apprenticeship weeks, 10 weeks of work experience and 33 weeks of employment on site for residents in the area, the firms said.
SEGRO worked with Hillingdon Borough Council and Uxbridge College to deliver the employment and skills project. Councillor Ray Puddifoot, Leader of Hillingdon Borough Council, pictured below, also attended the opening.
The trust said it has built and let over 120,000 sq ft in Hillingdon in the last 18 months.
Teams spent time with Uxbridge College, Haydon, Barn Hill and Bishop Ramsey Schools.
Andy Gulliford, Chief Operating Officer at SEGRO, also said: “Riverside Way is a great example of how working together with our partners can deliver for the local business and community. As well as developing and leasing modern sustainable buildings that attract inward investment to the borough, we are proud to have played a part in creating employment opportunities for local people.
“Going forward, our strategy is to continue to provide high quality space for industrial occupiers in Hillingdon and throughout London to enable businesses to thrive and we look forward to developing our partnerships further.”
SEGRO also announced the 10 year leasing of a speculatively built 27,243 sq. ft. light industrial unit to Steljes, a distributor of interactive technology products, which is new to the borough.