How can i prevent him from making her take a cash-out refinance, HELOC etc? 

I have seen a few condos that do not have "rental restrictions" but if you read their declarations it says no restrictions on leases that are more than 30 days, meaning they have a restriction and a right to enforce and prevent short term rentals(AirBnB).

Also, in my experience being kind and respectful as opposed to cold/letter of the law, prevents a large amount of retaliatory activity.

They can also show you flood maps, changes in upstream flood prevention work, and proposed changes. 

Lastly, emergency / cold weather manual or notice goes to all tenants on what to do , when snow removal is coming, keep temp extra high to prevent freezing pipes. 

Also, has she prevented you from increasing rent in 4 years? 

That will educate you and prevent frustration the next time an issue occurs.

@Paul Sandhu I wish I could; chronic back issues and working overtime prevent that.

The lease give you use of the property and the Option prevents your partner from selling to someone else. 

Both are VERY familiar with the machinations of the bad actors in the Real Estate field.It really is a problem that should NOT have every occurred and because it was certainly very prevalent, here in NYC especially, you will create leaders who will want to put a stop on these kinds of bad actors.It's very similar in the way that we should not abandon our Allies as you will create more enemies.In this case, the Rent-Controlled Renters are our Allies but they felt abandoned, at least, here in NYC.Again, these bad actors have also made it difficult for me to maximize my own profits on legitimate Market Rate Buildings as they illegally added market rate supply of buildings that should not have become Market rate.IF they did not get away with their bad behavior, I would have certainly have done even better than I have already done over the last 21 years I have been investing in NYC Real Estate.To me, these bad actors stole my profits and opportunities as a result of shifting the mindset of the renter class to be anti-Landlord while they reaped the illegal gains.Again, I am not saying ALL Landlords are bad.... but certainly "All Landlords are Good" is untrue.AND, as I pointed out, many of the bad landlords controlled a significant share of rent controlled apts to make a difference in our political atmosphere.We are in our potential Universal Rent Control situation for a reason that could have been prevented.