Another downside is you loose on the advantages, of the Federal Tax Code, by not closing in the name of a LLC (you can elect to have a LLC taxed, as a S Corporation which is a whole other conversation).If you want to close in the name of a LLC, Mortgage Lenders will offer you Commercial Loan Terms (25-30% down, a 15-25 year amortization, and a ballon due in 5-7 years).

Typically, the adjustments I see on appraisals for basements are more flat rate adjustments. 10k is usually the number I've seen.What stinks is that there are a couple of model types that have below grade space where the builder, I'm sure, was trying to lower the taxes by having it below grade so the county wouldn't count that space in the assessment.

Take stock of your current credit score and accounts.

I mainly want to ask if these assumptions are reasonable and if there's anything I haven't considered:(1) multifamily units in NJ close to New York City, ~$1,000,000, 20% down payment, (2) Using the following assumptions: 4% appreciation rate, 6.5% interest rate and 5.0% refinance after 5 years, $10,000 yearly maintenance fee(3) ~$6,000 monthly rental and assume 3% increase yearly with 5% vacancy rate(4) Based on the above, the calculated IRR if selling at the 10th year is ~19% (considering tax benefits) and ~17% (without tax benefits).

I have a confession: my only duplex, which I gave owned now for 2 years and recently moved out of from a house hack, has proven to cost me more to maintain/pay taxes/repair/fix etc to the point where my cash flow is close to zero.

Instead of evicting them, i was thinking is there some way that I could rent it back to him for very cheap (mainly to cover just the taxes/ insurance) ie 2k a year rather than the going rate of 2k a month for similar properties.

You may need to pay points if you put less than 20% down, but lots of no point options once you get to 20% down as long as you have decent credit scores. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Seller financed (probably) won't be reported to the credit bureaus and so won't impact your credit score at all.

In California there is $800 franchise tax per LLC per year, which discourages a lot of RE investors from getting an LLC.