I need a non-load bearing wall removed from the kitchen, add an island in its place, as well as some other random stuff in the unit, such as new bathroom sink, replace shower guts, lay herring bone pre cut flooring in the bathroom, lay concrete pavers on the balcony. 

Let them sink their own ship.

Although it might not be the best strategy to sink all cash in these properties, working with an investor who doesn't want to utilize any debt financing.

We renovated the heck out of it-brand new carpet, new porcelain tile and laminate flooring downstairs, epoxied the garage floor, new countertops, sink, pull down faucet, glass backsplash, new paint entire house, all new baseboards, added crown molding, and artificial turf and hard scaping front and back yard.

I'll admit that I was really unprepared going to this and still am but some times you just have to sink or swim right?

You could add a small kitchenette (hot plate, sink, toaster oven, fridge) and rent the basement out or alternatively you could live in the basement and rent the upstairs.

Always take tons of pictures when you leave (overall shots to inside oven and under sinks), especially if you can't get the landlord to schedule a proper walk-thru together (twice, my daughter has had landlords tell her they can't schedule a walk-thru with her).

The age of roof,windows, carpets,water heaters,furnaces,sinks,disposal units,repairs to appliances and structural as well as lot maintenance like fence repair or ect.

So now we have this house that has all kinds of renovations unfinished, and we're not sure if we should sink more money into it to finish everything and do it right and rent it out, or sell as-is and take what appears to be a significant gain and move onto a house that doesn't need so much work.

If you screen well and get good tenants, hopefully you won't have to sink a ton of money into the place when turning it over.