修订书 meaning in English

modification letter

Letter of modification
建筑牌照规约修订书
Deed of variation
契据修订书
Modifications , whether by modification letter or conditions of exchange , shall continue to be granted at premium reflecting the difference between the " before " and " after " land value
承租人不论是以修订书或换地条件修订土地契约，均须缴付土地补价；该笔补价须反映地价在修订前和修订后的差距。