Do damage to the industry as a whole. 

However, if for example, the company did not install or disconnect the washer and dryer correctly (such as leaving a valve on) while water is turned off prematurely, causing damage, what language do you put in the Lease to also hold other parties accountable such as ALE and appliance install company?   

Grocapitus is a breath of fresh air.

Sounds like an unreasonable seller and the most likely reason for them not wanting an offer with a financing contingency is the property is in too rough shape to get financing on it (structural damage, fire damage, etc.) or won’t appraise anywhere near asking price.   

I would imagine the best actions would be to immediately fire the management company, pass the keys onto a new one, sue the old one in small claims court for the listed damages.

What steps would you recommend to minimize damages and resolve this issue efficiently?

Often times when a builder/buyer moves too fast, or is too busy and overlooks a key piece of due diligence, the unethical ones will try the "scorched earth" method and blame everyone but themselves, even when they know it was their own mistake, and they'll see if they can scare you, the seller, the title company et al into paying damages/fixing their problem. 

Especially if seller just received a windfall from the sale it is definitely worth suing for damages.

Ya know, I wonder how many reached out airing how upset they are with the situation, there strong desire for a different outcome, and asking how they can help to make that other outcome a reality????

Not worth the liability risk and the potential damage pools leave.