The Grade-A Atria facility was sold by the council for £105 million.
Proceeds from the sale will be used to support the local authority's debt position and repay monies borrowed to facilitate the development.
In addition, the move will boost the council's Council’s Strategic Development Fund set up in 2013.
Located in Edinburgh's Exchange district, Atria was built along with the expansion of the Edinburgh International Conference Centre (EICC) in 2013.
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It is split between two buildings comprising of almost 200,000 sq ft of Grade A office and retail accommodation.
The project achieved both BREEAM 'Excellent' and EPC B+ ratings, making it one of the most sustainable developments in the city.
Other features include green sedum roofs, low E glass glazing, energy efficient lifts, electric car charging spaces and cycle spaces.
Councillor Gavin Barrie said: "This is a further endorsement of the Council's decision to create an innovative funding package to develop much needed Grade A office space in the city to attract new, and retain existing, businesses in the Capital while also cross-subsidising the cost of an expansion to the Edinburgh International Conference Centre (EICC).
"The fact that we have been able to attract investment into Edinburgh from a major overseas real estate company is testament to the quality of the building and its occupiers."
(LM)
