The developer – working with architectural practice SimpsonHaugh – claims the amendments will enable future commercial tenants to "operate their businesses in a carbon-neutral way".
They also bolster existing intentions for the building, which will provide 251,000 square feet of workspace, to have grade A specification, large efficient floor plates and other best-in-class ESG credentials.
It comes as a report by MPs warned earlier this week that the construction sector needs stronger government guidance to ensure it can hit net-zero targets and reduce its carbon footprint.
Salboy co-founder and managing director Simon Ismail said: "Occupier wellbeing and amenity are at the heart of Viadux, as well as our commitment to developing living and work spaces that help deliver a more sustainable future.
"Adding more high-quality amenity, alongside winter gardens and roof gardens, promises to give occupants plenty of space to relax, breathe and enjoy."
Viadux has been described by Salboy as a "complex mixed-use scheme" and is built on the former Bauer Millett car showroom site in central Manchester.
The project includes almost 380 apartments and grade A office space. It sits above a Grade ll-listed viaduct and bridges an existing Metrolink tram line.
Phase One began in 2020 to construct the residential tower; Phase Two is now under construction, expecting to complete in Q3 2024.
Associate at Knight Frank, the leasing agent for the project, Matt Shufflebottom said: "We are excited by the prospect of Viadux 2 and delighted to be working with Salboy, which has a proven track record [of] delivering best-in-class developments across the city.
"Viadux will push the boundaries for quality and occupier amenity whilst meeting important sustainability targets to provide much-needed grade A workspace for the city."
Last March, developer Ask pulled out of the Manchester-based project, leaving Salboy as the sole developer. The firm is using its construction partner, Domis, to carry out the work.
The project had originally been earmarked to be built by Carillion before the firm collapsed in January 2018.
Source: Construction News