Fire crews were called out to tackle the blaze at the Central Place in Hunslet in the early hours of yesterday morning.
The fire broke out in a timber-framed three-storey office building at the development, which was nearing completion.
At its height crews from 13 different stations battled the fire, which broke out on the third floor.
A West Yorkshire Fire and Rescue spokesperson said: “We received multiple calls from members of the public around 1.15am on Thursday morning, regarding smoke coming from the third storey of a timber-framed eco building under construction at Central Place in the Hunslet area of Leeds.
“The fire was extinguished around 4:55am.”