When the property at 70 Moon Mountain Road in Sonoma Valley was sold by one obscure business entity to another in August 2015, the move was applauded by the few local residents who noticed it. The site had been a half-built eyesore for several years under previous ownership.

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In retrospect, it was a portentous transaction.

The buyer was KS Mattson Partners, which was making its first real estate acquisition in the Sonoma area. The company would go on to acquire at least 88 properties in and around the city by 2023. Federal prosecutors now assert many of those purchases were fraudulently financed. KS Mattson Partners’ manager and co-founder, Ken Mattson, was indicted in May on a total of nine counts of wire fraud, money laundering and obstruction of justice, with prosecut

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