Apple's new HQ to be called Apple Park and to open in April

175-acre campus, designed by Foster + Partners, should have opened last year

Apple's new campus will be called Apple Park, and will open its doors to employees in April, the company has revealed.

Apple will also name the main auditorium at Apple Park after its founder Steve Jobs, who would have been 62 on Friday.

"Steve's vision for Apple stretched far beyond his time with us. He intended Apple Park to be the home of innovation for generations to come," said Apple CEO Tim Cook.

"The workspaces and parklands are designed to inspire our team as well as benefit the environment. We've achieved the most energy-efficient building of its kind in the world and the campus will run entirely on renewable energy."

The 175-acre campus in California, which was originally slated to open its doors in late-2016, has been designed by the British architectural firm Foster + Partners, who have kitted out the circular building with grassy fields and more than 9,000 drought-resistant trees.

Apple boasts that its design allows the campus to be powered by 100 per cent renewable energy adding that the naturally ventilated building is projected to require no heating or air conditioning for nine months of the year.

The aforementioned Steve Jobs Theater, which is a 20-foot-tall glass cylinder with a metallic carbon-fibre roof, seats 1,000 in its auditorium and is situated atop one of the highest points within Apple Park.

Apple Park will also be hope to an Apple Store and cafe for passing tourists, along with a 100,000-square foot fitness centre for staffers.

Moving more than 12,000 employees to the site will take more than six months, the company said, and some smaller building construction and landscaping will continue into the summer.