You have a three (3) year window from the date that you moved out during which you will still qualify for the tax-free exclusion under Section 121. 

The vast majority of our work for the last three years has been mid and high-rise apartments (up to 400 units), along with a secondary sector of hotels.  

My friend has just bought a newly built house in a nice area for $270k, sitting them for three months now not rented .

I have been educating myself now for the last three and half months on wholesaling down here in Miami.

Out of the three ways to get into real estate investing I listed above(house hacking, live in your flip, or wholesales) which is the best strategy to get started?

Looks like the electricial wiring is original two cloth-insulated wires, although the kitchen and bathroom have three-prong GFI outlets.

I would reside in one unit and rent out the other three units. 

I have three criteria for when I look to invest in any business - 1) I want to make a lot of money, 2) I don't want to spend a lot of time doing that and 3) I like businesses that are very simple - something I can easily explain to my wife and parents (and that's exactly why I lost money investing in Bitcoins!!

Flood insurance is $390, three of four units are rented.

I used a VA loan to "House Hack" my first three unit building.