While the landlord may own the property, you do have rights as a renter. Often, state laws will determine the reasons that a landlord may enter your apartment, and they usually include: making repairs, performing inspections, or showing the property to prospective tenants. Your lease may outline additional reasons.
Outside of emergencies like flooding, fire or a threat to life or property, a landlord must provide notice before entering your rental unit. While the notice period can vary based on the location and the reason for entry, it is typically 24 hours. If you feel that your landlord has violated the law or the terms of your lease agreement, it is best to speak with a lawyer.