If both properties have full access on their portion, without a need to utilize the other half, then there is no need for a shared driveway easement/agreement. 

This is not the time to be chomping at the bit to acquire real estate as a beginner -- you're not going to be finding good deals on the MLS like you could circa 2010-2011.The current newbie rage is to put out a million illegal bandit signs that read "We Buy Houses" or send out a million sleazy direct mailings that read "I wanna buy your house for CA$H!"

If you focused on acquiring SFR's initially and then step up to small MFR's after you have worked out the kinks, that would be likely easier and safer. 

Easy access tho' to just about everything in the city.

One stop shopping.https://techcrunch.com/2018/08/06/zillow-gets-into-the-mortgage-business-acquires-mortgage-lenders-of-america/

You want to review income statement from HOA before acquiring the property as many kept increasing fees to the point it is not worth owning a rental as business.

When I was analyzing deals in the Private Equity sector, I saw everything from 26% - 42% IRR needed depending on the size of the company managing assets, additionally how many Management/Fee company's are factored into the business model and at what point in the expense model they're collecting fees.There are payroll, Marketing, Office space, etc... now a part of your business model, acquiring an asset for cashflow becomes a small part of your equations. 

Account Closed  If you are just looking for some legal advices and legal documents review, legal zoom offers a business advisory plan which is very reasonable  price and you will get access to their CPA’s and attornies for six months.All the best for your searchDisclaimer : I have not tried their plan. 

You can acquire more properties and then do a commercial loan once they are rehabbed and seasoned.  

Do you already have access to that $400K?