In 2014, he was appointed city commissioner for finance, a post he held until the Conservative coalition lost the 2015 local elections.

[9] In mid November, he called on the national government to assist the municipality with police staffing and combating violence and criminal gangs.

[10] With strong blizzards covering large parts of Eastern Norway in January 2024, Lae Solberg advised the public to work from home and not utilise vehicles more than necessary.

While several counties in region had closed their schools, he stated he would restrain from doing so in Oslo, citing their importance and a high threshold to do so.

[11] He and finance commissioner Hallstein Bjercke presented Oslo's 2025 budget in September 2024, which notably included a proposed increase of 63% in water and sewage fees for the next four years.

Finance minister Trygve Slagsvold Vedum accused the Conservatives of breaking election promises of maintaining decreased fees in municipalities they secured power in.