Listed real estate investment trusts and top-tier property developers constructing mega-projects across the country are putting the final touches on a number of city shaping projects which are set to finish over 2020.

Sydney will soon welcome the city's tallest residential tower, being developed by Greenland in the CBD, as well as a new $1 billion landmark tower set to house the Nine Network and Microsoft.

Melbourne's tallest tower, delivered by World Class Global, is closing in on completion after five years of construction while the $1.25 billion mixed-use development affectionately referred to as “the pantscraper” is also winding up.

Sustained demand for high-quality commercial projects has helped push vacancy rates for office buildings across the eastern seaboard to record-lows and construction activity to its highest level on record.

The commercial boom, which started in 2016, has also driven an expansion of commercial investment and planning beyond the nation's two largest cities with a number of high-profile commercial projects coming online in 2020.

The residential high-rise market, which is slowly emerging from a two-year slump, has also benefited from pent-up demand that is not satisfied by the current low supply within the premium market.

Take a look at some of the major developments launching across the year that have pushed the limits of architectural and sustainable design.