(Bloomberg) -- JER Investors Trust Inc., a mortgage REIT, filed for bankruptcy in the latest sign of distress in commercial real estate.Most Read from BloombergPutin Shames Gilded Elite After ‘Almost Naked’ Party ScandalS&P 500 Bulls Drive Longest Weekly Win Since 2004: Markets WrapPutin Forced to Relocate Ships in Crimea After Ukraine StrikesDecade-Long S&P 500 Bull Surge Is Running Into a Valuation WallHistorians Need a Reality Check on the Great DepressionThe real estate investment trust — wh