FRANKFURT (Reuters) - German property group Deutsche Wohnen has agreed to acquire the bulk of the operations of peer Isaria for 600 million euros (548.21 million pounds), it said on Wednesday.Buyout group Lone Star, which owns Isaria, started preparations for a divestiture of the company last year, hoping to benefit from buoyant real estate valuations.The transaction on the sale of most of Isaria's operations, except for a few selected projects, is subject to the customary closing conditions..