Hmmm, just considering your question... I did not request legal advice on the specific question of RPZ rules applying to the type of tenant (U.S. corp in this instance). However, the management (letting) company we have used for 10+ years manage well in excess of 1,000 units on behalf of small landlords such as myself. They are not an auctioneering business, they focus on lettings only. I want to check myself saying this but.... I would expect them to "know" the RPZ rules... but I will put this question to our solicitor and revert next week once he has responded.