In Minnesota, a landlord must make a good faith effort to notify the tenant he/she will be entering. Reasonable notice may be a knock on the door, 24 hours, 48 hours — the definition of reasonable notice is open for interpretation.
The landlord, however, must have a reasonable business purpose for doing this. Valid reasons include:
If a landlord enters the unit without the tenant’s knowledge or presence, he is required to leave a notice that he was there and for what purpose. Of course, once again, that purpose must be a reasonable business practice.
The only exceptions to notice requirements are to prevent injury to people or property, tenant safety, or to comply with local ordinances regarding unlawful activity.