The Center City high-rise condo market may be soft, but Residences at Ritz-Carlton developer Craig Spencer won't let it get the better of his bottom line.  "I turned down a $1.3 million all-cash sale from a buyer who wanted me to cut the price by $50,000," Spencer said as he showed a visitor the 8,000-square-foot unfinished penthouse at the top of the 43-story, 270-unit building at 15th Street and South Penn Square....more.