What should an owner of non-kosher nursing homes do on Pesach – the homes will be serving chametz, as they do all year round. Does a typical ‘shtar mechira’ (as some use for Shabbat) allow attributing the ownership of the chametz to the partner?
Yes, the best arrangement will be to sell the nursing home for the duration of Pesach to a partner, so that the owner will not have any share of the chametz.
This is presumably similar to the shtar you mention, though I do not know the details of this shtar.
Please post another question in more detail if this is required.