The move brings to an end rumours that the headquarters staff were set to be sent to a new base in Swindon.
Staff concern was first sparked when the quango's bosses relented to the demands of their landlord to leave their Fortress House HQ to make way for an Eric Parry-designed replacement.
But yesterday it was revealed that the organisation has signed a lease to take on the Grade II*-listed Alfred Waterhouse building - the first time EH's London staff have worked in a listed building.
Originally built for Prudential Assurance, the Holborn building - which is undergoing an internal fit-out by Allen-Bell Architects - was originally completed in 1901.
Photograph by Anthony Sutcliffe