Unioninkatu 18
Premises: Kaartinkaupunki, Unioninkatu 18, 00130 Helsinki

The premises at Unioninkatu 18, completed in the 1930s, are comfortable and offer flexible layout options. They are well suited for both private office rooms and open-plan office use, providing a functional setting for a variety of working needs.

Located in Kaartinkaupunki, this office and retail property combines a central location, a distinguished setting and a peaceful atmosphere. The street level features retail premises with large display windows, while the upper floors offer office space that can be flexibly adapted to the user’s needs. Some of the office spaces include balconies facing two directions. A short walk away, you will find high-quality restaurants and hotels, as well as many of Helsinki city centre’s highlights, such as the Old Market Hall, Tähtitorninmäki Park and Esplanade Park. Kaartinkaupunki is a charming blend of old and new — right in the heart of Helsinki, yet with a calm atmosphere of its own.

Unioninkatu 18 offices have been awarded a BREEAM In-Use certification with a rating of “Excellent” and it operates on 100% emission-free energy such as wind power and renewable district heating. Solar power plant on the property roof produces renewable on-site energy.

Property details

Accessibility

Unioninkatu is located in the heart of Helsinki, in the immediate vicinity of the Market Square, Esplanadi Park and Kasarmitori Square. The nearest tram stop is located at Market Square, and the nearest metro station is in Kluuvi.

Nearest connections: Metro: a 10-minute walk to Yliopisto metro station. Train: a 14-minute walk to Helsinki Central Station. Helsinki-Vantaa Airport: approximately 30 minutes by train from the Central Station.

Services

There are numerous restaurants, hotels and conference centres in the area. The Market Hall and the Market Square are also nearby.

Within walking distance, among others: Restaurants: all city centre restaurants. Hotels: Hotel F6, Hotel Haven, Bob W Helsinki Kaarti. Pharmacies: Kaartin apteekki.

Parking

The property has 6 parking spaces in the courtyard. Private parking garage Aimo Park Kasarmitori only 2-minutes walk away.

Office space – 5th floor – 271 m²
Office space – 5th floor

271 m² private office space on the 5th floor of Unioninkatu 18, Kaartinkaupunki. The space is a through-floor space and has been used as an embassy. The accompanying floor plan shows the current layout; the premises can be adapted to suit specific needs.
- Floor area: 271 m²
See more
Office space – 6th floor – 221 m²
Office space – 6th floor

221 m² office on the 6th floor, Unioninkatu 18, Kaartinkaupunki. The neat space is a through-floor apartment with two balconies. The accompanying floor plan shows the current layout; the premises can be adapted to suit specific needs.
- Floor area: 221 m²
See more
Office space – 2nd floor – 109 m²

Loose furniture added with AI
Office space – 2nd floor

This is a Move In space: a move-in-ready office you can use from day one. No renovation, no waiting. 109 m² office space on the 2nd floor of Unioninkatu 18, Kaartinkaupunki. The neat and bright space offers an efficient layout.
- Floor area: 109 m²
See more
Retail space – 1st floor – 64 m²
Retail space – 1st floor

A compact 67 m² retail space in good condition in the idyllic Kaartinkaupunki. The space features large display windows facing Pohjoinen Makasiinikatu.
- Floor area: 64 m²
See more
Retail space – 1st floor – 57 m²
Retail space – 1st floor

A neat, efficiently laid-out street-level 57 m² retail space in the charming Kaartinkaupunki district. The space features large display windows facing Pohjoinen Makasiinikatu.
- Floor area: 57 m²
See more

Name	Floor	Area	Availability	Description
Office space	5	271 m²	Free	The space suits a company of 21–36 people and can be easily converted from private offices to a more open-plan solution. Several separate rooms allow for quiet work. Windows on two sides bring plenty of natural light and open views to both Pohjoinen Makasiinikatu and the building's inner courtyard. The Unioninkatu 18 property combines a valuable city centre location with a peaceful working environment. The property has a BREEAM In-Use Excellent certification, demonstrating responsible operation and maintenance, energy efficiency, and healthy indoor conditions. The University of Helsinki Metro Station is a 10-minute walk away, and Market Square and Esplanade Park are right next to the property. Pricing on request — contact for quote.
Office space	6	221 m²	Free	The space suits a company of 17–25 people and is located on the top floor of the building. It is a through-floor apartment with views of both Unioninkatu and the peaceful inner courtyard. The space’s current layout combines open-plan and private offices. The space can be easily converted into separate rooms or meeting facilities according to the tenant's needs before moving in. The Unioninkatu 18 property combines a valuable city centre location with a peaceful working environment. The property has a BREEAM In-Use Excellent certification, demonstrating responsible operation and maintenance, energy efficiency, and healthy indoor conditions. The University of Helsinki Metro Station is a 10-minute walk away, and Market Square and Esplanade Park are right next to the property. Space available immediately. Pricing on request — contact for quote.
Office space	2	109 m²	Free	The space suits a company of 8–16 people and offers a flexible layout, which includes both open-plan area and private rooms. The space is bright thanks to large windows and easily adaptable to the tenant's needs. The Unioninkatu 18 property in Kaartinkaupunki (a historic district next to the city centre) is known for its distinguished surroundings and historical architecture. The property has a BREEAM In-Use Excellent certification, demonstrating responsible operation and maintenance, energy efficiency, and healthy indoor conditions. The University of Helsinki Metro Station is a 10-minute walk away, and Market Square and Esplanade Park are right next to the property. The space is available immediately. Pricing on request — contact for quote.
Retail space	1	64 m²	Free	The Unioninkatu 18 property combines a valuable city centre location with a peaceful working envi-ronment. The property has a BREEAM In-Use Excellent certification, demonstrating responsible operation and maintenance, energy efficiency, and healthy indoor conditions. The University of Helsinki Metro Station is a 10-minute walk away, and Market Square and Esplanade Park are right next to the property. Space available immediately. Pricing on request — contact for quote.
Retail space	1	57 m²	Free	The Unioninkatu 18 property combines a valuable city centre location with a peaceful working environment. The property has a BREEAM In-Use Excellent certification, demonstrating responsible operation and maintenance, energy efficiency, and healthy indoor conditions. The University of Helsinki Metro Station is a 10-minute walk away, and Market Square and Esplanade Park are right next to the property. Space available immediately. Pricing on request — contact for quote.

Unioninkatu 18
Premises: Kaartinkaupunki, Unioninkatu 18, 00130 Helsinki