As of today (2020-03-19), Simon Property Group's share price is $55.74. Simon Property Group's Cash Flow from Operations per share for the trailing twelve months (TTM) ended in Dec. 2019was $12.37. Hence, Simon Property Group's Price-to-Operating-Cash-Flow Ratio for today is 4.51. Simon Property Group's Cash Flow from Operations per share for the three months ended in Dec. 2019 was $3.13. Its Cash Flow from Operations per share for the trailing twelve months (TTM)ended in Dec. 2019 was $12.37. $西蒙地产(SPG)$ 经营上有什么重大问题吗？除：疫情问题。。。