sa=...Question 2, you could try and sue but id take it out of the security deposit and move on.

They are securities but backed by real estate and commercially evaluated real estate at that. 

Then I'd like to  make the rest of my own contribution as employee of ($19,500-$6645) = $12,855 to equal the maximum allowable of $57,000 (37500+12855+6645) If this is how this works...I'm assuming 57k is max across everything...My question is, since my main job has already payed both the employer and employee portion of the social security tax, will I only have to pay medicare taxes on my 2nd business?

How do you collect a security deposit for tenants that currently live in one unit of a multi-family I'm scheduled to close on in two weeks?

im not sure which type of brick wall you are referring too, but framing wont vary much on cost for the same wall that is load bearing verses non load bearing. its more a function of materials and complexity. as for bundling, anything is negotiable. in general, i have found it much easier to negotiate with contractors for bigger versus smaller jobs. put yourself in their shoes, a bigger job has more security and profit. i would be willing to accept lower rates for a project that will take 4 weeks versus one that takes 2 days. 

So if your $1,000,000 oceanfront property gets swept out to sea in a raging Nor'Easter, you can rest secure that you'll collect $250,000!

(3) If Option B happens and I'm not able to come up with the full closing costs myself, would I be protected by the mortgage contingency, since I technically wasn't able to secure a loan for the full $703,500?

Yes, transferring title from an individual borrower to an LLC controlled by original borrower is exempt from Due on Sale- D1-4.1-02 of the Fannie Mae servicing guide, allowable exemptions-a limited liability company (LLC), provided thatthe mortgage loan was purchased or securitized by Fannie Mae on or after June 1, 2016, andthe LLC is controlled by the original borrower or the original borrower owns a majority interest in the LLC, and if the transfer results in a permitted change of occupancy type to an investment property, such change does not violate the security instrument (for example, the 12 month occupancy requirement for a principal residence).

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

Were these loans you made to him secured by any interest in the property or simply a verbal agreement?