NEW YORK-Crown Castle International Corp., Houston, found itself in an enviable position when it went to Wall Street last week proposing to issue $250 million in senior notes due 2011. Instead, it was able to raise $500 million, with a 10.75-percent coupon, through an offering led by Goldman Sachs & Co. and Chase Securities Inc. The company will use the proceeds to repay part of the term loans it took out to finance its purchase of towers from GTE Wireless.