Castellum reports its sustainability activities in accordance with GRI Standards: Core option. The GRI’s industry-specific supplements for the construction and property sector have been taken into account. The following table specifies where the information has been reported. For specific standard indicators, reporting relies upon what is essential to business operations. We report in accordance with the 2016 GRI standards, with two exceptions. GRI 403 Occupational Health and Safety is reported in accordance with the 2018 standard, and GRI 207 Tax is reported in accordance with the 2019 standard.