The bank is sequestering his property due to unpaid loans.

sequestering 是动词 sequester 的现在分词形式。sequester 来自拉丁语 sequestrare，意思是"分离、隔离"，在法律语境中特指"依法扣押、查封财产"。这里指银行因贷款未偿还而采取的法律措施。