Nope, they are just obligated to cure the problem. 

If you are just curing the default with a trustee you can clear things up until the day of the sale.

So, to that regard, you would not be in a position to foreclose since you didn't actually make demand properly and allow suitable time to cure.

My first approach was to refi them, but if that didn't work I then moved on to other alternatives to cure the situation.Brokers who sell in the secodary market may never know if a loan they originated goes into default, it depends on the servicing agent and the nature of how the mortgage was originated, with or without recourse.

Find a breach of the lease (change locks, storing stuff in garage when not permitted, painting the walls purple. . .) and slap em with a 5 day notice to cure or quit.Then start the eviction proceeding.

If they do not maintain the lawn they will receive a 10 notice for violating the terms of the lease and to cure the violation.  

If there is anything inside that is serves exclusively a particular unit, then it's still that unit's responsibility to cure, providing that HOA grants the right to access that space for the repair and the owner hires an HOA authorized licensed and insured professional. 

@Nabeel MahmudIn Pennsylvania, the tenant generally has the right to cure a default that relates to failure to pay.

In intestate succession instances we will use and Affidavit of Heirship to lay out the familial circumstances that are relevant and file that of record to cure the gap in title.

As always my advice to new landlords is to find a landlord/tenant attorney and have a discussion about relevant laws.I would address this with a "cure or quit" notice.