Many will break a lease when a landlord tries to enforce their lease provisions about extra people living in the home, getting rid of unapproved pets, charging them for damages, etc.

They will not (in my experience) sue to enforce their contract. 

But there are things that you can do to increase the ancillary income along the way such as enforce the late fees or any other fee arrangements that you have in the lease.

How do you enforce late fees?

When necessary, the government will enforce the note with the 1003 information in hand and prosecute the signatories.

Generally any lien imposed by the government (whether federal, state or local) is going to survive the sale and quiet title which includes utilities, special assessments, lot clearing, code enforcement, demolition, IRS, etc.

To have a lawful and enforceable LO, the option price must be stated as to as a known value, saying the amount remaining due on an underlying mortgage on some future date is not an amount certain and is only set based on future requirements being met by the seller, as their obligation, which is another kicker to toss out a LO as there can be no expectations required by the seller and changing the type of contract.

Beyond that, they administer the established rules and policies of the HOA, including rule enforcement, but they do NOT create the rules; or make decisions on choice of vendors; or when, how, or how much money to spend OR to assess Owners.To be clear, the duties, responsibilities, and discretion in management decisions, as well as the actual contract, are vastly different between a Rental property PM, and a Condo/HOA Account Executive/PM. 

If they are VERY professional, they will have their processes in writing as verification that policies are enforced equally and fairly by their entire staff.6.

So many landlords just throw up notice as a threat, but never enforce it.3.