There does not apper to be an analogous legal concept in Estonia. I expect the text refers to the UK? As I understand, the concept exists in the UK because the Housing Act 1988 specifies that only individuals (not companies) can be tenants (https://blog.openrent.co.uk/company-lets-what-are-they-how-a... so the company let concept is a way around this. In Estonia, there does not appear to be any such restriction (contracts, including tenancy agreements, are regulated with the Law of Obligations Act - https://www.riigiteataja.ee/en/eli/504102021001/consolide), so a tenancy would be concluded with a regular tenancy agreement.

Therefore, I would recommend translating descriptively (ettevõttega sõlmitud üürileping = tenancy agreement concluded with a company), perhaps even including the original term in brackets. If the text includes an explanation of what is meant, or if the text is the actual agreement itself, then the specifics of the meaning will be explained in the text.