U.S. stocks closed mostly lower Monday after German ifo Business Climate and expectations data and U.S. Building Permits topped estimates, while New Home Sales declined. In commodities, WTI Crude Oil futures gained for a fourth consecutive session on concerns over Ukrainian drone strikes on Russian oil refineries and export terminals. Elsewhere, gold was barely changed, while Silver futures declined and Copper futures advanced. Ahead this week: U.S. Durable Goods, the Case-Shiller Home Price index, and Conference Board's Consumer Confidence data.