It will move into its new premises, in North Wharf Road, in September 2017, subject to planning permission, in a scheme which will also see 190 new homes built and is part of the wider regeneration of Paddington Basin regeneration.
The free school was founded in early 2014 and has been temporarily housed in Kilburn while Westminster City Council and Education Funding Agency worked on the permanent home.
It accepted its first intake of 120 pupils in September last year and will move into its new home with 480 pupils. At full capacity it will have a student population of 840 pupils, including a mixed sixth form.
A Pentecostal Church currently on the site will be relocated as part of the school scheme, which will also see a quarter of the new 190 homes being built made affordable.
It was announced in April last year that a permanent home for the school had been found, but its details were kept under wraps until now.
Headteacher Richard Ardron said: “We are delighted that Westminster City Council and the Education Funding Agency have worked tirelessly to secure a first-class site for the school and we look forward to working in partnership with them as they build our new school.
“The new purpose-built premises will enable us to build a long-term future for pupils in Westminster.”
Council leader Philippa Roe said: “We have worked closely with the Education Funding Agency to find a permanent home for Marylebone Boys’ School, and are now looking forward to seeing this exciting new building delivered in the heart of Paddington.
“The school will add to the already excellent education facilities that Westminster offers, providing a high-quality learning environment for local pupils and helping to meet the future need for secondary school places.
“In addition to providing for local pupils, this scheme will also contribute to the wider regeneration of Paddington Basin, which is fast becoming a thriving destination in its own right.”
The new development will be in close proximity to the outdoor amphitheatre at Paddington Central and the planned new public garden at the Paddington Exchange development. Several major companies are headquartered nearby.
The procurement process for a development partner has now taken place and an announcement on the selected partner will be made over the coming weeks.
Last year it was announced that a permanent spot for the school had been located, but no further information was given.