The government of Norway, an active buyer and seller of U.S. commercial property, is shifting its strategy to focus more on stocks, bonds and other securities as a way of diversifying its holdings. A new investment mandate calls for the country's Government Pension Fund Global, known as GPFG, to move more toward securities of companies and investment funds instead of properties. It has more than $1 trillion in assets and is the world's second-largest pension fund behind Japan's Government Pension Investment, according to global insurance brokerage and advisory firm Willis Towers Watson.