Why are legal documents in English?

The California Civil Code addresses the management of legal documents in the State
of California in Section 1632. This section of the law states, among other things, that if a business owner negotiates contracts, including rental or lease agreements in a language other than English, then the business owner is required to translate legal
documents into all other listed languages, which are Spanish, Chinese, Tagalog,
Vietnamese, and Korean. It is not only time consuming, but difficult to translate
accurately into many different languages.

It is for this reason that attorneys representing business owners, including
mobile home parks, recommend that all legal documents and negotiations be done in
English.

When it is necessary for translation of the documents, the prospective resident or
current resident of a mobile home park, as an example, must provide their own interpreter
who must be 18 years of age or older.

Source: Insurance Information Institute.