Though it may cash flow well based on their current debt service, when you compare the income it produces to the equity they have is it actually even a good investment for them from an ROI perspective or would they be better off liquidating and redeploying?

Great rental income, strong FICO, low LTV (60% or below), strong liquidity and PFS.

If they are the one providing most of the cash, they might not want to carry that liability, but you've already negotiated with your partners on this and then the bank isn't cool with it, you could be in a pickle.

Some ideas I've considered:Equity Buyout: Having another investor or my partner buy out my 40% equity.Seller Financing: Selling my equity and offering seller financing to the buyer.Selling the Property: Liquidating the property entirely and splitting the proceeds.Does anyone have experience with situations like this?

The garage was built to work on trucks having 14' ceilings and 2 bay doors heating cooling about 700 sqft.

Should get a lower interest rate on your loan since these are liquid assets. 

New floors, appliances, heating/cooling, etc.

Let's assume that the neighborhood is a C class and the median income of the city is greater than 3X of the market rent.Here are some of the considerations I've come up with so far:- Units are in need of renovation and capex is too high or not available- Unit quality is not the same as market - Seller is worried about losing tenants due to increase- Vacancy rates are high or filling units have been difficult- Rent increase would take multiple increases over multiple lease periods to get to market rate if seller is trying to retain the same tenant- Seller inherited property and just want to liquidate- Seller needs to liquidate quickly (financial burden, sickness, quick exit from land-lording)It seems like I might be missing a warning sign about a deal if they are selling with current rents that are under market; but again, this seems to be most of the properties I've underwritten.And in the same vein, what should I be worried about when purchasing a deal with under market rent with the intention of raising them after purchase. 

Real estate is one of the best mind-sharpening exercises in the investment world simply because getting it wrong there is no stock liquidation or quick way out.

It is a really cool idea.