If you really want to get a deal from tax liens, contact the homeowner just before they reach the 5 year deadline.....

They can make or break your numbers and deadlines.

I would give them suggested vendors, a consequence for failing to complete, a deadline to complete the work, and notice that I will inspect to verify the work is done to my satisfaction.After notifying the tenant, then I would contact the owner (phone or email, depending on their personal preference and my time) and let them know what happened and how I'm addressing it. 

If they do not leave by the move out deadline, can I start eviction process? 

Quote from @Marshall Rousseau: They sound like awful tenants.When you expect something from someone, give them a deadline and a consequence for failing to respond."

Because we needed more time to gather quotes for the work that needed to be done by contractors we trusted, we extended the deadlines in the Property Inspections Notice (PIN) on multiple occasions so we had enough time to better understand the issues and also protect the buyer's deposit.I'd get a few good contractors on hand, have them give estimates (see if they can even do it using the inspection report if visiting the property isn't possible) and have the seller compensate you an amount that you think is fair (it may not cover everything, but is it enough to still make the deal work?)

In order to prepare for disclosure deadlines and detect potential deal roadblocks, the seller may carry out "reverse diligence" on the buyer.Finally, it's crucial to comprehend the motivation behind the trade.

These are hard target deadlines and we had a third 1031 exchange company handle the transactions. 

The Inspection Follow the terms of your contract and calendar your deadline for due diligence.

The most important step is to set a deadline and take action!