Redwood Trust entered the single-family rental market this week by purchasing a stake in 5 Arches, a lender and asset manager. The move is part of a diversification strategy for Redwood, with officials at the real estate investment trust expecting growth among renters. Redwood acquired a 20.0 percent interest in 5 Arches with a one-year option to purchase the remaining 80 percent of the company. Redwood paid $10.0 million in cash for the minority stake and can buy the rest of the ...