U.S. investor interest in Britain is growing, helped by more appealing "leasing fundamentals" and a stronger dollar versus the pound, BNP Paribas Real Estate said. U.S. property markets remained mired in concerns about sticky interest rates, a slower return to the office and political uncertainty before the U.S. election, it added. U.S.-based investors spent 1.9 billion pounds ($2.4 billion) on London commercial property in January-March - up six-fold on the prior year and the most since the final quarter of 2015, according to the data.