A bit more info:
Make sure the first notice you provides outlines all the ways in which they are in violation of the lease. If you just say they're late on rent, and they pay you, you can't take them to court. For you, even if you outline everything, but then they take care of everything within the 2 weeks (clean the yard, no more complaints, pay rent and DD, get rid of the other 2 people), then you can't evict them.
Normally in this case, depending on the type of lease you have, if they're paying rent and generally complying, you would have to ride out the length of the lease, or if you're on month-to-month, you need to give them 3-months notice. BUT, if the condo board keeps getting complaints, they can evict a tenant for you within 30 days. So you may want to keep in contact with the board in case you want them to help you expedite that.
Setting up a walkthrough shouldn't be a problem. You just need to give them 24 hours notice to enter the premises. I don't think you really need to specify a reason. After all, you've gotten complaints.
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