Douglas Emmett, among the largest landlords in the San Fernando Valley, has increased the offering price of its expected IPO to $21, the high end of its range, according to a report by Renaissance IPOhome.com. The L.A.-based company earlier said it expected to price its stock in the range of $19 to $21 per share. Douglas Emmett also said it would increase its stock offering by 20 percent to 66 million shares. The IPO is expected to begin trading tomorrow.