@Adam PutschoeglIf you have some equity in the property, taking out a HELOC would likely be your least expensive and most flexible form of loan.

How do I make the offer attractive, professional and flexible in case I need to increase my offer?

.✅ We can be nimble and flexible.✅ We are resilient.✅ Teams can work remotely.✅ Real Estate can be toured and purchased virtually.✅ Relationships can continue to be fostered remotely.Within challenges, there are opportunities and learning experiences!

My question though... is it beneficial to replace it with a better door (for future re-configuration flexibility), or to just permanently seal it off? 

See if they want to do a 1031 exchange for another piece of property and be flexible on Closing date. 

Each additional property purchased or paid off with the line pays off faster than the last with the additional cashflow.It maximizes flexibility, and allows deposits/idle funds to work for me, rather than BoA or Wells Fargo.

Your landlord sounds very generous and flexible, so I'd focus on your house hunt and get something under contract sooner than later.

You would be hard-pressed to find the same flexibility with a bank.Cons;1.

Currently working from home and looks like he will have a lot of flexibility once this covid stuff is done. 

The property would gross well over that amount and I am fairly confident it would be at least breakeven with a freelance property manager.My wife and I don't plan on buying a permanent residence as we like renting for the flexibility and convenience.