a design build agreement

[zava_zava]

пожалуста, помогите найти русский вариант этой фразы,

предложение звучит так:
Further to my E-mail, I propose an alternative to our prior proposal, a design build agreement.

We believe that the design build alternative will accelerate the pre-construction period and reduce the overall construction period.

[foxtrot]

договор на проектирование и строительство, имхо