The Grade II listed-building, which spans six floors and covers over 121,000 sq ft, has attracted several FTSE 100 companies for events.
The venue includes a 300 seater auditorium for conferences and exhibitions, 18 meeting rooms with integrated AV equipment, 41 boutique bedrooms with en-suites, 6 heritage rooms with traditional features, 2 penthouse state rooms with capacity for 216 people and a rooftop terrace with views over London.
The building’s traditional features have been restored and combined with the inclusion of new AV technology and wi-fi capabilities, including 3D projector screens, digital signage and Dolby surround-sound speakers. The venue will be managed by Searcys.
Yvette Bradley, general manager at 30 Euston Square, said: "30 Euston Square is a stunning, unique venue, providing the perfect blend of character, history and heritage with modern and cutting-edge facilities.
"We are incredibly excited to be officially launching the venue, having seen it transform throughout the redevelopment. We are certain that it will become a target for businesses from all over the UK."
"As well as providing a world class venue, we also benefit from an exceptionally convenient location. Euston Square is within walking distance of three major railway stations and via Euston has direct access to Birmingham, Manchester, Liverpool and Glasgow. Paris, via St Pancras, is just 2.5 hours away."
All profits generated through 30 Euston Square are returned to the Royal College of General Practitioners (RCGP) to support their work at the forefront of primary patient care.