The value of investments in UK commercial property fell 8.7% over the fourth quarter of 2007 compared with the year-earlier period, IPD said in a new UK Quarterly Property Index report issued on Thursday. Total returns on property investments in the country slumped to -7.6%, the biggest fall in the history of the index and an unprecedented reversal that has dragged the 12-month total return to -4.4%, itself the lowest calendar year return since 1990.