I don't have all of the details, but I worry that the management company could be taking advantage of them.I do not have the capacity to get involved and am not educated in this area, but was wondering if anyone has general advice on how she and the other condo owners could best seek to protect themselves and resolve their dispute with the management company?

I would be curious to know how many investors are really purchasing residential real estate deals with owner financing...The idea of owner financing in the context of a residential property has always seemed to me to be a bit of an urban legend; something promoted by so-called gurus to new investors hoping to get started buying deals with "other people's money" and no capacity to get a loan from a traditional lender.Let's consider the the most basic version of owner financing:  Buyer agrees to purchase property from seller. 

If you don't have capacity in the current circuit box, that means upgrading 40 units.What's the real ROI?

If no will then they'd have Letters of Administration.Either of these documents would give the children legal capacity to sell the property.If probate has yet to start, then maybe you could buy out the children's legal interest in the property and start the probate process yourself.  

If you're asking how they can serve me in the capacity as a financial planner, then they need to be able to model real estate investments like they do stocks and use real estate investments in their financial plans.

However, the only thing you have left out of your post is if you are sure you have the extra capacity (with respect to amps) in your panel to run an additional 33+ amps. 

Novelty haunted house tourism realty as a short-term rental is actually a good idea, if you have the capacity to do some good marketing for it. 

In what capacity the served notice be enforceable?

I have a contractor who might be interested in investing or partnering in some capacity... contributing 20k toward the down payment and about 25k in repairs for a total of 45k upfront. 

There is no capacity for making contributions to an IRA in-kind, and the IRS certainly has no interest in trying to properly attribute value to an individual's services as contributions - so much room for mis-interpretation and malfeasance....