New York’s Brookfield Office Properties Inc. announced Thursday that its newly formed DTLA Holdings will acquire downtown L.A.’s troubled MPG Office Trust Inc., Bloomberg News and Dow Jones Newswires report. Brookfield will offer MPG’s common-stock holders $3.15 a share in cash — 21 percent more than Wednesday’s closing price — and begin a tender offer for preferred stock at $25 a share. Total value of the deal is $180 million.