Castellum

Castellum is one of Sweden's largest real estate companies, managing a diverse portfolio valued at SEK 89.2 billion, which includes office, warehousing, logistics, and public sector properties across a total leasable area of 4.2 million square meters. The company operates in 20 cities in Sweden, as well as in Copenhagen and Helsinki, emphasizing a decentralized management structure that ensures a strong local presence. Castellum is recognized for its sustainability initiatives, having received awards for its efforts, including being ranked first globally in the offices-and-logistics sector by GRESB and achieving the Level Gold award from the European Public Real Estate Association for sustainability reporting. It is also the only Nordic real estate and construction firm included in the Dow Jones Sustainability Index, signifying its commitment to sustainability. Castellum's business model focuses on developing and renting properties, with investments in new construction, extensions, reconstructions, and acquisitions aimed at enhancing property density and quality while maintaining low financial risk.

Rutger Arnhult

CEO

Past deals in Oslo

Entra

Post in 2025
Entra ASA, a prominent Norwegian real estate company, specializes in developing, owning, and managing high-quality, environmentally sustainable office properties. Its portfolio is predominantly concentrated in Norway's major cities, with Oslo being the primary market, accounting for over half the portfolio's value and rental income. The company primarily leases its properties to the public sector, with rental income being the principal source of operating revenue. Additionally, Entra generates income through property appreciation and sales.
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