Typically speaking 20% down (80% LTV) is the bare minimum that commercial lending requires.  10% down is unheard of unless you are getting a great deal and negotiate some small seller financing in second position or getting an SBA Loan for acquisition where your business will occupy over 51% of. 

It’s a lot of work for a measly 200 dollars a month which is the typical cf on a 60-80k home that rents for 850.

There is no given answer here, because the whole property needs to be relatively consistent.Kitchens and baths are the common answer, but if they are passable and you choose to invest in them anyways at the expense of peeling paint (or off putting exterior color) and overgrown landscaping, the appraiser and tenant will be walking up with a bad taste in their mouth, thereby not valuing the interior work you have done.But think about the general flow of someone looking to rent: more bedrooms will typically dictate more rent.  

The other option is a water supply line, but that would typically resulting a steady leak and the damage would occur faster.Really think about what is above that space that could cause the issue.

It's typical to sell 40k programs to people after the free or low money get together.

The rate will be higher (typically 1% to 1-1/2% higher) but you will be able to sell, refinance, or payoff the loan without  having to worry about paying what could potentially be thousands of dollars in a pre-payment penalty. 

Depending on how much equity in the property would be key as you cannot borrow 100%, if its investment property 80% is max typically. 

If they do not qualify because of poor credit or income issues compared to being self employed etc there are differences - but typically people don’t qualify due to poor credit and people will seller finance to these borrowers thinking they woke up at a holiday inn and got a finance degree when in reality they repeat their past mistakesRemember the definition of insanity is doing the same thing over and over again expecting a different result

For quick and easy, typically check the property sale records and MLS for residential.

Mortgage interest deductions are typically claimed by the partnership on its tax return and passed to partners via K-1 forms.