By Amber Murray According to new data from the real estate arm of BNP Paribas, American investment in London property has jumped to its highest level in eight years. According to BNP, US investors spent £1.9bn on London commercial property from January to March, a 64 per cent rise from the previous year and the highest level of investment since 2015. “This positive uplift into this new cycle tells us US capital is firmly back in the market,” said BNP Paribas Real Estate’s head of central London capital markets Fergus Keane, adding that political tensions in the US were “certainly at play” in e…