The college is busy packing up its temporary offices near St Paul's in the City of London and will complete the move to its new, grade 2-listed premises near Euston Station by Monday.
It says the new headquarters will offer 'unparalleled services to members'. Facilties include an examination centre, members' lounge, study bedrooms, a 300-seat auditorium and conference facilities.
Unseasonal downpours in the spring meant the move was delayed by a couple of weeks.
The college occupied the original Princes Gate site in central London for almost half a century.