Every person in possession of land out of which any rent is due, whether it was originally demised in fee, or for any other estate of freehold or for any term of years, shall be liable for the amount or proportion of rent due from the land in possession, although it be only a part of the land originally demised. Such rent may be recovered in a civil action, and the deed, demise, or other instrument showing the provisions of the lease may be used in evidence by either party to prove the amount due from the defendant. Nothing herein contained shall deprive landlords of any other legal remedy for the recovery of rent, whether secured to them by their leases or provided by law.