mumbai real estate firm kolte patil developers today said it has entered into a joint venture agreement with a subsidiary of usbased portman holdings llc to develop a rs 275crore residential project in puneaccording to the agreement both the companies would hold 50 per cent stake in the joint venture firm named bellflower properties pvt ltd kolte patil developers said in a filing to the bombay stock exchangethe project would consist of a midsegment residential project in pune the filing addedportman holdings llc is a real estate development company with projects including hotels office buildings retail spaces and residences it addedshares of kolte patil developers were trading at rs 5880 on the bse up 271 per cent from its previous close