Both sides are leased at low rent with no security deposit.

I could sell one of my properties (condo) use, that money for flips in Atlanta within the next 1-2 years build up additional funds to acquire an apartment complex, and to grow my portfolio, but I want to hear from some experienced investors and what they would do if they were in a similar position.Current Picture/Portfolio: Property 1: Condo (Atlanta, GA 30328)Current Rent = $1550/MonthUtility Reimbursement = $200-300/MonthHOA $383 (In line with HOA's for other communities) Purchased June 05th, 2015 and resided in property until Jan 22nd, 2017 (Total of 1.64 Years)Lease Started Jan 23rd 2017 and Lease Ends on June 30th 2018.Current Equity 135,000 (Purchase Price)  - 85,000 = $50,000Current Comps Similar Properties are selling for $155,000 to $170,000Current Mortgage Terms: 15 yr Fixed 3.325% Monthly payment of $996 (Includes Insurance and Property Taxes)Anticipated Total Earnings if Sold at End of July $64,500 (Sell Price $155K) to $78,500 (Sell Price $170K)  Property 2:Town-home (Peachtree Corners, GA 30092)Current Rent = $2000-4000/Month (AirBnB) 60-70% Occupancy since November of 2017Purchased July 28th 2017 and currently residing in basement house-hacking with my younger brother.HOA $325/Month Covers, Water, Lawn Maintenance, Sewage, Security GateCurrent Equity 336,000 (Purchase Price) - 265,000 (Remaining Loan Balance) = $71,000Current Comps Similar Properties are selling for $345,000 to $360,000 due to private/public school ratings going up shortly after purchase.Current Mortgage Terms: 30 yr Fixed 4.326% Monthly payment of $1823 (Includes Insurance,PMI, and Property Taxes.)

Here's a sample of fine print:“Borrower shall occupy, establish, and use the Property as Borrower’s principal residence within 60 days after the execution of this Security Instrument and shall continue to occupy the Property as Borrower’s principal residence for at least one year after the date of occupancy, unless Lender otherwise agrees in writing, which consent shall not be unreasonably withheld, or unless extenuating circumstances exist which are beyond Borrower’s control.”Different lenders have different "fine print" statements that may be more grey and confusing.

They seem inexpensive but not sure if that is what I would want as they may be less secure for larger storms.I know I am asking a lot of questions so I appreciate any help you guys can give to a new investor!

I did the deal more to secure the land which is literally across the street from a major OC university. 

A HELOC is a loan secured by the equity in your property.

Or if I get a duplex are their special laws for me as a landlord living in one side or is that pretty similar to just having a regular tenant in a separate home

But when I sell the property and give him some of the profits, wouldn't he be taxed at his regular tax brackets and not capital gains levels?

I have recently witnessed some people around me that I look up to have financial troubles in fields/jobs that should be “secure.”

Is there particular/formal documentation we need to provide regarding the transfer of security deposits, rents, agreements, etc?