I have 16 years of investing experience and have been involved in over 5K real estate transactions. 

If don't do a 1031 exchange and decide to pay capital gains, I would have about $450k free of taxes (this accounts depreciation and other costs).

Of course I also check my investment accounts frequently.

Your guess is as good as mine.When considering buying down the interest rate, take into account the length of the payback period.

So about 1,100-1200 monthly expenses after groceries and other miscellaneous things I’d say.This is what I own:Bank: 35kCash: 7kInventory (business): 230kRobinhood brokerage: 27kFidelity Roth: 5.5kRoth 401k: 32kPersonal money market account: 15kBusiness money market account: 42kTotal liquid cash: $393,500Debt: -16,000 college loanHow should I go about investing this?

Do you process credit cards as part of your business or have accounts receivable outstanding?

Need to take that into account. 

This is what I own:Bank: 35kCash: 7kInventory (business): 230k Robinhood brokerage: 27kFidelity Roth: 5.5kRoth 401k: 32kPersonal money market account: 15kBusiness money market account: 42kTotal liquid cash: $393,500Debt: -16,000 college loanHow should I go about investing this?

You file Articles of Formation with the state, get a Federal EIN and a bank account. 

Get your title company and lawyer involved before you sign anything.