|Project „Expo 2000, phase IV”
„Office building EXPO 2000 - phase
IV" is located at “N.Y. Vaptsarov” Blvd. in Sofia and constitutes the fourth
stage of the ambitious construction development „Business complex „Expo 2000“.
Phases I, II and III are executed and fully operational. Phase III and IV are
designed as a single architectural image and are executed through a blind wall
connection. The Employer is "Åxpo 2000 Real Estate" EOOD and "Raiffeisen
Property Holding International” GmbH.
“Bavaria Aircondition Engineering” OOD has provided services for the concept and working design development
for parts HVAC, WSS and BMS, coordination of the
designs, as well as project management and site supervision of the works for construction
and commissioning of the building. The scope of assigned services has been
also extended to design, coordination and supervision
on the execution of the respective tenants’ fit-out works, including quality
and costs control.
The building has a total built-up area
of around 23 000 m2 and offers to its visitors modern conveniences, comfort
and security achieved by a luxury interior and functionality in the separation
of the areas, high quality of used construction materials and technologies for
execution of the installations and equipment in the offices, underground
parking on two levels with enough parking places, access control system and 24-hours
security and video monitoring.
to the building is provided on one side from “N. Y. Vaptzarov” boulevard and on
the other side – from “At. Dukov” street. Entry and exit points for traffic are
provided through the existing ramps in phases I and III. Due to its strategic
location the complex offers accessibility by private and public transport.
architecture and dynamic silhouette contribute to the attractive and
representative appearance of the building. In terms of architecture Phase 4 of „Expo
2000“ consists of a high-rise 8-storey part of the building and complementary two
crossing wings (6 or 7 stories) . There are two underground parking levels with
a capacity of 267 cars. The underground parking lots servicing the occupants of
the four buildings in the complex are connected which facilitates the
exploitation and access to the buildings.
façade of the building consists of a light metal structure incorporating solid,
transparent, openable and fixed elements. The arrangement of the façade panels
is based on a 150-cm grid which allows for a flexible division of the interior
cladding panels are designed in accordance with the concept for materials and
colour (Cembrit) implemented in phase III on the one hand and on the other hand
- the darker colours of these materials are used as well in the facade
front part of the main building is architecturally connected to the boulevard
and the entrance area is emphasized through the two-storey arcade on each side
which is supported on inclined columns.
high entrance hall is completely glazed at the front side. The main access
point is integrated into the facade through a canopy construction which
continues through the main entrance lobby providing access to the office areas
located from ground floor to level 7, as well as to the underground parking.
The lobby is designed and executed in compliance with state-of-the-art
standards for aesthetics and functionality by implementation of green walls, a modern
reception desk and waiting area. The materials used include natural stone and
wood covering on the floor and the walls, and the proper location of elevators,
staircases and sanitary premises provides easy access even with people with
The office floors allow for a flexible
division of office spaces and natural lighting by providing an option for
installation of partitions at every 1.5m along the façade.
The heating and cooling system of the
building relies on multifunctional air-cooled heat pumps located on the roof. These
are able to provide simultaneous and independent flow of the required energy
for heating and cooling through the system of chilled ceiling panels, active
chilled beams and fan coil units. Considering the two-storey height of the main
lobby there is provided floor heating, as well as channel fan coil units.
The office areas are separated into
zones. Each separate zone is controlled by a thermostat which delivers a signal
to the six-way control valves in order to ensure a proper selection of
air-conditioning regime: cooling, heating or switch-off.
Provision of fresh air for the office premises
is carried out by two air handling units located on the roof. The air is supplied
through chilled beams located in the suspended ceiling along the perimeter of
A particular system has been designed for
the underground parking – it includes supply, exhaust and jet fans for
extraction of processed air from the parking lots on levels B1 and B2, as well
as for heat and smoke exhaust in case of a fire. Part of the ventilation
systems in the garage shall be controlled through “CO” (carbon oxide) sensors
which shall detect the level of vehicles’ exhaust fumes.
Parts of the roof are executed as green
areas and the vegetation thereof is provided as facade greenery on the eastern
elevation of the lower part of the building and represents a visual connection
with the adjacent landscaping.
Lighting of the office areas is provided
through energy efficient LED standing lamps standing with sensors for motion
and luminance control. The zones around the central core are provided with LED
linear luminaries installed in the suspended ceiling. Separate areas of the
building are also equipped with light detectors that also improve the energy
consumption values of the building.
All systems are provided with automatic
control of their functionality via the implemented building management system.
The majority of the outdoor space is provided
with intensive greenery, partially with high-rise vegetation species.
On the terraces of the crossing wings
roofs are executed the so-called "green islands" with intensive green
areas suitable for planting smaller trees.
The last floor is will be with extensive
green area. There is located a technical room with area of 300 sq.m and a technical
On the territory of Expo 2000, phase 4 there
is envisaged area for a cafe-restaurant. Near the business complex there are
additional catering and accommodation facilities, retail areas, sport and
leisure amenities. There is forthcoming rehabilitation of the road
infrastructure which shall ensure a better traffic flow.
materials used for construction comply with the criteria for sustainable
construction certification in terms of energy efficiency, low level of
dangerous emissions and are accompanied by the respective declaration of
The building is awarded
with a platinum certificate as per the standards of the sustainable development
rating system LEED.