Morphological question concerning attributive nouns

[Unregistered]

Concerning attributive nouns or any noun used as an adjective, specifically on the use of "plantation" and property" before company, industry, etc. Is the addition of a plural inflection on plantation/property advisable? I have come across many instances against and for the practice, and would like to have some authority on the matter; if prescriptive, the rule giver. Thanks.

P.S. I'm certain the choice of "properties company" has been motivated by the desire to emphasize the fact that the company is involved in many different kinds of properties. Naturally I'm aware to the rule that adjectives do not have an inflection for quantity (for what point is there to it?) but are the current usage been all for the plural form in attributive position?

[Soup]

Paul Rastall, On the Attributive Noun in English (1993), discusses the falsehood of the standardly expressed rule of English that an attributive noun is singular, unless no singular exists. Modern English admits both singular and plural attributive count nouns; the selection of number of the attributive noun depends on the sense to be conveyed. This proof suggests that constructions of the (attributive noun + noun) type are syntactic rather than morphologic.

[Soup]

The Chicago Style Manual suggests that if singular nouns can act as attributive nouns — city government, tax relief — then plural nouns should be able to act as attributive nouns: consumers group, teachers union. This principle is not universally endorsed, however, and writers must remember to be consistent within a document.

Chicago Style Q&A: Possessives and Attributives