AEW Capital has locked up a $180 million loan for the purchase of the Hudson Square office tower at 330 Hudson Street. Mutual Life Insurance Company assumed the $178 million debt on the property from a consortium of lenders led by American General Life Insurance and also granted a $1.9 million gap mortgage. The sellers were a joint venture of Canadian pension fund manager Ivanhoe Cambridge and Callahan Capital Properties. The 16-story office building is the headquarters of the British publishing firm Pearson’s North American, which takes up 70 percent of the building. Other notable tenants include TripAdvisor and General Motors.