Barratt said the two joint ventures would bring the gross development value of the group's JVs in the capital to more than £2bn.
Barratt said British Land and Barratt London have secured planning permission for 463 homes, a 160 room hotel, retail and offices at Aldgate Place on the edge of the City.
The development will include three towers of over 20 storeys as well as public open space and a pedestrian street.
It will have a GDV of around £250m and work is scheduled to start early in 2014.
Barratt London has also confirmed that it is progressing its joint venture with L&Q, to develop the Sainsbury's site at Nine Elms.
The £425m scheme has gained consent from Lambeth council for 645 homes, a new Sainsbury's store and circa 27,000 sq ft of retail and offices.
Source: Paul Norman, CoStar