I’m not sure. See the Wed. StarTribune: Professors’ sabbaticals clash with rental laws.
Since the revision, professors on sabbatical leaves discovered, sometimes by calling city building official Jim Kessler, that they were no longer exempt from rental rules, including a ban on rentals of more than 20 percent of the homes on a block. For those on blocks maxed out with rentals, that meant leaving their homes vacant, or renting illegally during sabbaticals. Kessler said he suspects that some surreptitious renting is going on. The colleges grant sabbaticals of varying lengths every four to seven years for study or research.
Also see the Dec. 3 Nfld News: Rentals now outlawed may become legal