The transformation of London's former US Embassy into the Chancery Rosewood is complete, as the all-suite hotel opens to welcome its first guests in one of the capital's most recognisable modernist landmarks. Olivia Palamountain reports

After some four years in the pipeline, the Chancery Rosewood has opened its doors, breathing new life into Mayfair's Grosvenor Square.

The decadent hotel occupies the Grade II listed former US Embassy building, designed by Finnish-American architect Eero Saarinen in 1960 and now architecturally restored by Sir David Chipperfield.

Happily, the building's iconic gilded eagle sculpture by Theodore Roszak, crafted from B-52 bomber aluminium, remains positioned overlooking Grosvenor Square.  The all-suite property features 144 accommodations designed by French interiors architect Joseph Dirand, with accommodation ranging from junior suites to two-bedroom penthouses with landscaped terraces.

Guest services include flexible check-in and check-out times without specified windows, house car transfers and personal butler service for occupants of signature suites and houses. The elimination of traditional front desk procedures sees guests greeted directly and escorted to suites upon arrival.

The hotel's dining programme includes eight restaurants and bars, including Serra, offering southern Mediterranean cuisine, and Tobi Masa, signalling the London debut of chef Masayoshi 'Masa' Takayama.

While not connected to Rosewood directly, the building will also house Carbone - marking the first European location of the New York Italian-American restaurant.

All dining facilities operate with ground-level access, positioning the hotel as a neighbourhood dining destination beyond its guest accommodation.The property introduces what it describes as the first hotel clinic of its kind through the Taktouk Clinic, operated under Dr Wassim Taktouk's guidance within the Asaya Spa. The subterranean wellness facility includes a 25m swimming pool, five treatment rooms and fitness centre featuring Technogym's Artis equipment line.

Tiered spa memberships provide access to wellness facilities, complimentary treatments and preferential clinic rates, though specific pricing remains undisclosed. The clinic integrates dermatological treatments with hotel spa services, targeting guests seeking medical-grade skincare alongside traditional hospitality amenities.The building's houses a 700-piece art collection curated by London-based Cramer & Bell, featuring works by established and emerging artists. Commissioned pieces include works by Sir Christopher Le Brun above the main fireplace and 278 artworks by Anthony Grace throughout guest suites, exploring American landmarks and presidential history.

Accommodation includes houses named after American historical figures connected to the building's diplomatic past, including the Saarinen House, John Adams House, Kennedy House and Chancery House. Two seventh-floor penthouses, Charles House and Elizabeth House, feature dining areas for ten guests and fully equipped kitchens.Event facilities include a grand ballroom accommodating 750 guests, two salons and pavilion spaces targeting corporate and private functions. The venue's diplomatic heritage and central Mayfair location position it for high-profile gatherings and industry events.

The hotel opening represents significant adaptive reuse of a culturally important building, demonstrating how diplomatic architecture can transition to commercial hospitality whilst maintaining historical integrity.Room rates are available on application; membership fees for spa facilities have not yet been disclosed.

The building's transformation concludes years of planning since the US Embassy's relocation to Nine Elms, providing new commercial life for Saarinen's modernist design whilst preserving its architectural and historical significance for future generations.