The present building on the Union Club site will be refurbished to become a teaching centre.
The proposals will now be taken through the design stage by architect Erick van Egeraat and theatre consultant Iain Mackintosh. The initial designs should be completed by summer 2002.
The Arts Council has pledged £50m towards the project with the rest to be raised by the RSC.
The project is likely to be completed by 2008.
The feasibility study, leading up to yesterday's announcement about the future of Stratford, was led by van Egeraat and Michael Rushe.
The rest of the team, appointed in December last year to work on the redevelopment of the 14 acre theatre complex, includes QS Gardiner & Theobald and conservation consultant Alan Baxter & Associates.
As well as the main building work, the project will include improvements to indoor and outdoor public spaces within the theatre village, improved catering and bars, more retail space, hospitality and meeting areas, an RSC nursery, more RSC residential accommodation within and outside the village and a long-term refurbishment programme for the Arden Hotel.
Earlier proposals for the main theatre, which were among 14 plans considered for the complex, had included knocking down the hotel.
Where the £100m will go
- New 1050 seat theatre in place of RSC theatre
- 650 seats added to Other Place Theatre
- Full refurbishment of the Swan Theatre
- Upgrading catering, leisure and educational facilities