The Mumbai Customs has attached the properties of Bollywood producer Bharat Shah and his partner in a diamond export unit after they failed to cough up about 30 crore rupees as duty, penalty and interest amount in a 13-year-old duty evasion case.The attached properties include Shah's flat at Swapnalok building, Malabar Hill area, his office in The Plaza, Hughes Road area, partner Suken Mehta's flat at Sterling Apartment on Peddar Road in South Mumbai and their factory in SEEPZ at suburban Andheri, said a senior Customs official.The case, involving alleged irregularities import andexport of diamonds, dates back to February 2000 when a survey by officers of Customs had discovered that BV Jewels was not maintaining proper records and accounts resulting in detection of cut and polished diamonds without payment of duty.