Newmark Advises Martley Capital Group on 47,170-Square-Foot Flexible Workspace Agreement at Birmingham's Mailbox
Newmark has advised Martley Capital Group on a management agreement with flexible workspace operator Chadwick Flexspace Solutions covering 47,170 square feet at Mailbox, Birmingham — a transaction the parties describe as one of Birmingham's largest office deals by square footage in 2026 to date.
The agreement will see Chadwick Flexspace Solutions lease and operate a flexible workspace within the mixed-use Mailbox scheme, located at Commercial Street in Birmingham city centre. The space is set to reopen under the name Mailbox Business Centre in autumn 2026.
Deal Structure and Space Configuration
Under the management agreement, the fully fitted workspace will be brought back into operation with the majority of the existing fit-out and furniture retained and reused. The space will comprise a mix of open-plan and private offices, meeting rooms, collaborative breakout areas, kitchen facilities, and an external terrace.
George Jennings, Partner – Agency – National Offices at Newmark, advised on the transaction. "This agreement between Martley Capital and Chadwick Flexspace Solutions demonstrates the continued demand for high-quality, flexible workspace in Birmingham," Jennings said. "By securing an experienced operator and retaining most of the existing fit-out, Martley Capital has been able to bring a significant amount of space back to market efficiently."
Fraser Ramage, Director – Real Estate Debt Capital Markets at Martley Capital, said the move is part of the firm's broader asset management strategy. "Bringing this space back into operation with an established local operator is an important step for Mailbox and for our wider asset management strategy," Ramage said. "Chadwick Flexspace Solutions has a strong track record in Birmingham, and this agreement supports our commitment to providing occupiers with high-quality workspace in a market that continues to evolve."
Chadwick Flexspace Solutions Expands Birmingham Footprint
The Mailbox agreement expands Chadwick Flexspace Solutions' presence in Birmingham alongside its existing operations at Eleven Brindleyplace, located at 2 Brunswick Square, Birmingham. That 12-storey Grade A building offers private offices and flex suites ranging from one to 218 desks, with office sizes from approximately 484 to 1,915 square feet, marketed on fully inclusive, flexible terms.
Richard Douglas, Managing Director at Chadwick Flexspace Solutions, said the Mailbox location represents a meaningful step for the operator. "Mailbox is one of Birmingham's best-known business destinations, and this space provides an excellent opportunity to expand our presence in the city alongside our existing operations at Eleven Brindleyplace," Douglas said. "Its quality and central location enable us to offer occupiers a ready-to-use workspace solution that meets a wide range of business needs while broadening the range of workspace options available across Birmingham."
Chadwick Flexspace Solutions said it is in discussions with prospective occupiers ahead of the centre's opening.
Mailbox Asset and Birmingham Office Market Context
The Mailbox is a mixed-use scheme spanning approximately 689,000 square feet of Grade A space across a 4.8-acre site in Birmingham city centre. The building features LG7-compliant LED lighting, exposed services with comfort cooling, 4.4-metre floor-to-ceiling heights, raised access floors, and a secure cycle hub. The 47,170-square-foot suite involved in this transaction sits toward the upper end of the building's typical floorplate range.
The deal arrives as Birmingham's prime office market faces constrained supply. Prime office vacancy in the city stands at 3.02%, with total vacant supply at 1.53 million square feet — equivalent to 8.6% of stock — and forward supply described as historically low. Annual office take-up has reached 651,507 square feet across 98 transactions, with major occupier commitments from firms including EY and Deloitte. Prime headline rents have risen to £52.00 per square foot, representing approximately 50% rental growth since 2020.
About the Parties
Newmark Group, Inc. (Nasdaq: NMRK) is a commercial real estate advisory and services firm. For the twelve months ended June 30, 2026, Newmark generated revenues of more than $3.6 billion. As of that date, Newmark and its business partners operated from over 195 offices with more than 10,000 professionals across four continents.
Sources
More Leasing
Popup Bagels to Open First Arizona Location at Gilbert's Heritage Park as Five Tenants Join Mixed-Use Project
GXO Logistics Signs 35,000-Square-Foot Lease at Hines' T3 FAT Village in Fort Lauderdale
