Synergy Tower is a multifunctional business office building situated in Sofia Tech Park with a TBA of approx. 52 822 m2 and offers open space offices and commercial premises with stores, restaurants a recreation area, and a dedicated parking space.

Synergy Tower is a sustainable next-generation green building that meets the latest technological and architectural trends and follows all integrated technical systems resulting in remarkably low energy costs and an outstanding sense of light and comfort.

Unifying two totally independent building bodies, Synergy Tower offers spacious and efficient areas with facilities, meeting the highest technical requirements of its tenants. The first 8 floors above the ground floor, boasting a spacious lobby, have a leasable area of 2725 sq.m. with up to 360 workspaces, suitable for the arrangement of 4 independent offices. Floors 9 -14 have 1325 sq.m. of leasable area with up to 180 workstations.

For the comfort of each visitor, the building provides easy access with 402 parking spaces for vehicles 30 motorcycles, and over 300 for bicycles. Everyone who chooses the more ecological way of transportation can also enjoy dressing rooms and a shower zone.

Synergy Tower offers plenty of social and sports amenities that boost productivity and please all employees and visitors. According to the regulations of Sofia Tech Park, no less than 30% of the tenants have to be engaged in an exploratory activity. Stepping on the limitless science and technological opportunities of the location, each company that chooses Synergy Tower will take advantage of a high potential environment with the innovative neighbouring companies in the area.

The construction of the building has started in February 2019 and the building was completed in the third quarter of 2021.












Synergy Tower has a LEED certificate: one of the world’s leading and most renowned certification systems for green building leadership. LEED monitors and ensures the projects meet the most stringent environmental requirements in the field of construction.

The certification process follows the whole life cycle of the building: from design and construction, operation and maintenance, to modernization and reconstruction, and covers indicators in six categories: Site selection, materials and resources, energy and atmosphere, water use efficiency, indoor environment quality, and innovation design.

Synergy Tower is designed to be extraordinarily highly energy efficient. Its dynamic shape is designed according to the latest tendencies of a new generation of “green” business buildings to leave a minimal footprint on the surrounding nature.

Equipped with a photovoltaic system on its roof, the building can produce up to 20% of renewable energy. This is the very first tall building in Sofia that have outdoor blinds. These are controlled automatically through sensors that evaluate the positioning of the sun, the amount of precipitation, and other factors to lower the expense of energy and provide maximum comfort for its inhabitants.


The investor behind the project Synergy Tower is the Bulgarian Real Estate Fund (BREF) ( a real estate investment trust (REIT). The fund specializes in the acquisition and investment of highly efficient properties that fulfill the following criteria:

  • Excellent location and good transport infrastructure
  • Functionality and contemporary technical solutions
  • Sustainable and health-promoting surrounding
  • High standards that fulfil and exceed all clients’ expectations
  • Professional management of the premise

During the last 15 years, BREF has invested in the construction of contemporary office buildings whose tenants are some of the largest companies from the IT sector in Bulgaria. The trust continuously monitors the property market to identify opportunities and realize them thereby expanding its portfolio with office and residential premises in Sofia

Among the successfully completed projects of BREF REIT are Kambanite Business Center (TBA: 32 000 sq.m.), where Hewlett Packard established their central office for Bulgaria, East Tower with main tenant VM Ware (TBA: 13 500 sq.m) and Kambanite Green Offices (TBA: 13 299 sq.m.), in which some of the tenants are Neterra, TEU Group, Dynata, and Konica Minolta.


“A&A Architects LTD” (, the designers of Synergy Tower, are a Bulgarian award-winning studio with proven excellence in architectural and urban design. With their completed business and residential interior and exterior projects, “A&A Architects” have a long and proven expertise led by their mission for optimal balance between aesthetics, functionality, economic value and ecological responsibility.

The architects have been devoted to the philosophy of corporate responsibility regarding environmental protection and the pursuit of sustainable and balanced development.

“A&A Architects” have also completed various other projects such as: Business Park Sofia, Capital Fort, Children’s science museum “Muzeiko”. All of these have contributed to development of the capital and improved the city skyline.