I am not sure if there is any legal obligation to provide my personal details.

You're under no obligation to give the appraisal to the seller. 

I don't know if whether this should be a single member LLC or have us both be on the LLC and if so, if that could open the parent to piercing the corporate veil with the payments. 

It's like any other service.. are you looking to get coffee with a friend at the best local coffee shop (still expensive) or do you need to place an order with starbucks for a corporate event you are hosting.

However, what you said confused me a little because you said that I could contribute 25% or 20% depending on if it's an S-corp or LLC but if I'm reading you correctly, those limitations are only on the employee side? 

But I buy only well-built quality housing in the best markets.I haven't given up, but I gave up my corporate job over 12 months ago...so I feel like I've done quite well.

I recommend that my clients use life insurance to plan for the future tax obligation: either there will be a death benefit to pay the tax or there will be cash value that can pay the tax.Even if the seller chooses to remain in real estate, when they buy their next property, they will start off with a fresh depreciation schedule.

@Ben Tilbury, I have used UIF Corporation for multiple mortgages. 

I am by no means saying this is a bad company or even a bad investment, all I am saying is do your own due diligence - all of this information is readily available on the SEC website to review and understand what you are investing in:below is from the SEC website• The Notes are unsecured, general recourse obligations of the Company that will be repaid from the Company’s working capital.

Many for-sale by owners aren't aware they are legally obligated to disclose.