As long as you cash flow on the property and don't drastically increase your primary mortgage, I would do it.

If I bring the property, will other investors typically be ok with fronting the entire renovation cost (so long as the numbers make sense) and split profits 50/50 or does the partner who fronted renovation usually receive more than a 50 split?

As long as my withdrawals from the accounts are due to normal maintenance, they remain pretty balanced.I hope that is helpful and please feel free to reach out with any questions!

The HVAC unit is working no more or less by conditioning that space, so long as it's a) not pulling return air from the common space, b) is not reading a thermostat temperature from the common space, and c) not dumping an incredible amount of air into the space (all of which should not be happening regardless).

As long as you are upfront with the potential tenants and include it in the lease seems fine to me.

So as long as your the delivered vacant is still on your contract they have to follow that unless its removed. 

I'm looking for preventative maintenance to make sure things last as long as they can.

I agree that a lease is a legal document, but I've also been around long enough to know that some people don't care and ask long as they come out ahead, that is all they care about. 

If I were to keep the home indefinitely, I feel like there is no real downside besides owing way too much on the home which obviously isn't a "good" situation but I think as long as you hold it as a rental, there is no real loss?

As long as it’s not losing steam, we’re ok.