Howdy from Texas. I have a rental property in a college town. On the back of the property we have a one bedroom guest house that is not rented. We stay in the guest house for football game weekends (about 14 personal days as allowed by IRS). Additionally I stay in guest house for business trips to manage my other rental properties in the town (saves hotel expense, etc). I am taking normal rent expenses including cost seg for rent house. How should I treat the guest house? Is there any event that will trigger some kind of disallowed expense because I am sleeping there more than 14 personal days? (But the more than 14 days are strictly business purposes)