Right to demand additional rent in the Japanese Law of Landlord and Tenant

日本《房东与租客法》中要求追加租金的权利，据说是源于对地条款的规定。但与德国法律相比，这种观念显然是错误的。该权利被授予出租人以换取承租人的保护。日本不仅在住宅租赁中承认承租人的保护，而且在商业租赁中也承认承租人的保护。但我们必须重新审视商业租赁中对承租人的保护是否应该保留。

It is said that the right to demand additional rent in the Japanese Law of Landlord and Tenant came from the rule of clausula rebus sic stantibus. But compared with German Law, it is evidennt that such idea is an error. The right was given lessor in return for protection of lessee. In the Japanese the protection of lessee is recognized not only in a domiciliary lease but also in commercial lease. But we must rewiew whether the protection of lessee in commercial lease should be preserved.