2.5% of this retention sum shall be

2.5% of this retention sum shall be released upon client's issuance of certificate of practical completion and the remaining 2.5% of the retention sum shall be released thirty calendar months after the date the purchaser takes vacant possession.

Results (Chinese) 1:

此保留金额的 2.5%应被释放后，客户端的签发证书的实际完成和剩余的 2.5%的保留总和应释放买方占有空置情况的日期后的三十日历月。

Results (Chinese) 2:

此保留金额的2.5％，应根据客户的实际发放结业证书，并保留金额的剩余2.5％的公布将购买需要交吉日期后三十个日历月被释放。

Results (Chinese) 3:

2.5%的保留金额应在客户签发实际完成证书后释放，其余2.5%的保留金额应在购买方占用的日期后三十个月内公布。