Castellum sells Stockholm office portfolio to Alecta Fastigheter

Castellum has agreed to divest two Stockholm office properties to Alecta Fastigheter for an underlying property value of SEK 5.01 bn (€439.5 mln).

Pål Ahlsén

This exceeds the properties' Q1 2026 carrying value of SEK 4.46 bn (€391.2 mln), generating an estimated total earnings impact of roughly SEK 700 mln (€61.4 mln).

Isotopen 1 and Klassföreståndaren 3 span 36,100 m2 of leasable space, holding an annual rental value of SEK 237 mln (€20.8 mln) and an 89.7% economic occupancy rate.

Castellum plans to return approximately 60% of the sale proceeds to its shareholders, with the remaining 40% allocated toward debt reduction to maintain its current loan-to-value ratio.

Subject to approval from the Swedish Competition Authority, the deal is scheduled to close on 1 September 2026.

Pål Ahlsén, CEO of Castellum, commented: “We are divesting two properties following a structured sales process in which a large number of parties have shown interest. These are two modern and very high-quality properties in excellent locations in Stockholm. However, in our assessment, these properties will not generate a sufficiently high return for us in relation to the price we are now receiving, which is why we have chosen to sell. We are pleased to sell to Alecta Fastigheter, a well-reputed owner.”