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Tommy Christy, Invitation Homes' regional president, right, checks one of his company's homes in Rocklin, which was being renovated last week for rental. Nick Volkov prepares a hallway for painting. All the company's renovated homes get the same color paint and carpeting. Invitation is an arm of Blackstone, a New York investment fund that has by a sizable margin become the largest landlord of single-family homes in Sacramento County in just the past eight months.