LONDON (Reuters) - The Lloyd's of London building, a landmark in the City financial district, is to be put up for sale in the autumn for 320 million pounds by owners CommerzLeasing und Immobilien AG (CLI), a report said on Friday. At that price, the futuristic 310,000 square feet (28,800 sq metres) building -- which is home to Lloyd's , the world's oldest and biggest insurance market -- would have a rental yield of around 5 percent, the report in trade magazine Property Week said.