The two practices were both involved with working up plans for Number 1 Crown Place before the site was sold by its owner in late September.
Rab Bennetts of Bennetts Associates told the AJ he 'breathed a sigh of relief' over the announcement that the site had been sold.
His practice was due to face a public inquiry over the council's non-determination of his practice's application to build an 11-storey office complex there.
Bennetts' application was greeted by disapproval from the London borough's planning officials in May because it required the demolition of Georgian terrace houses in the Sun Street conservation area.
Horden Cherry Lee had been appointed by developer Tanshore to cast 'a fresh set of eyes' over the project but the site was sold before it could submit a planning application.
Separately, Horden Cherry Lee - the practice behind plans to house students in 'microflats' (AJ 23.08.05) - has submitted a planning application for a plot on the same Hackney street.
The architect's plans are for a 19-storey redevelopment at 30 Crown Place. According to Horden Cherry Lee, these proposals 'respond positively to the urban character of this part of the City fringe'.