How often do you inspect your rental property?

I own a duplex and our tenants leases are coming due in the next few months. I thought that would be a good time to inspect the property for any problems. Do you inspect your property on a regular basis - semi-annual, annual or more often? We change the furnace filters and replace the smoke alarm batteries... show more I own a duplex and our tenants leases are coming due in the next few months. I thought that would be a good time to inspect the property for any problems. Do you inspect your property on a regular basis - semi-annual, annual or more often?

We change the furnace filters and replace the smoke alarm batteries each Fall, but don't really do a more formal inspection. We live in Wisconsin.
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