The ".25" articles within various 'low voltage' Articles addresses abandoned cabling, BUT, there is nothing specific regarding wiring that you specify.
Various local property maintenance codes may address your issues directly.
I would try a 1 on 1 conversation with the tenant/owner, and explain the fact that liability could be on there shoulders if someone were to get injured. Stressing that it is a more economical move to have wiring safed-off than getting involved with lawyers/insurance issues.
