Stockholm is one of Europe's fastest growing cities, Sweden's capital region and economic center. More than 2.2 million of Sweden's nearly 10 million inhabitants live here. Its Gross Regional Product (GRP) is the ninth highest in Europe; London has the highest GRP and Paris is in seventh place. More than a third of Sweden's total population growth over the next five years is expected to take place in Stockholm.

The exceptionally strong population growth creates opportunities and challenges. Large infrastructure investments to increase accessibility have been implemented in approximately 90 different road and rail projects such as the Stockholm Bypass, the City Tunnel and the expansion of the subway and light rail. At the same time there is a great need for new jobs, new homes and new schools.

Stockholm is dominated by the service sector. One in four of all Swedish companies are located in Stockholm. Among start-ups that number is even higher; one in three started in the Stockholm region. Both the county and city of Stockholm have lower rates of unemployment in relation to the workforce than the rest of the country. Stockholm has three of Sweden's largest universities with about 80,000 students and the Stockholm region has a higher percentage of people with a college education than the rest of the country.

Castellum holds around 100 properties in Stockholm in prime and strategic locations - along the major transit routes, near collective hubs and in the city center.