You could be drop shipping from an Amazon warehouse business using leveraged inventory and doing the exact same thing or borrowing billions to buy NVIDIA GPU's to retrofit and add on to your own servers like my favorite business does, SMCI. 

Check out my personal favorite, Set For Life by Scott Trench , or The Total Money Makeover by Dave Ramsey.3.

It's like asking "What type of food is good?"...

One of my favorite PM companies did this. 

- What are the typical/favorite contingencies do you add for four-plex property?

Food for thought, I can go on forever but this is the mindset I would have if I was in your shoes.

McDonalds might not allow a chicken restaurant or a Starbucks, Panda Express wants to exclude ALL Asian food (Thai, Pho, etc.) so it is paramount that you understand the exclusive use clauses in each of the leases in the property that you are buying and how it will affect your ability to re-lease your spaces when they do ultimately go vacant. 7.

usually my favorite post goes like this..."

From making your own coffee at home to savy investor tactics, what's your favorite way of saving money that you've found very useful till this day?

Every single day, I would log onto Trulia and browse through the homes, picking out my favorites.