You could potentially put as little as 3% down if it's a single family home and 5% down for 2-4 units.

You can still find single-family homes in the $80k–$100k range and duplexes in the $130k–$150k range, even in C and C+ neighborhoods that are seeing steady improvements.

Cons:revenue basically breaks even.

I currently have a single family property averaging $330 a month in cash flow which is going into a basic checking account seperate from personal.

the value added versus cost to add, especially in single family zoned areas, typically results in a large negative initial position.  

There are exceptions, like what was mentioned by @Nathan Gesner, if you are an employee of the property owners, and you exclusively manage their properties, if you're a resident manager, living in the building that is being managed, or if you are someone who manages properties owned by a single entity and have a direct ownership interest in it.

Between the time associated with making the investment, tied up capital and associated stress involved, even if the investment breaks even or produces a small gain most would look back and wish the money sat in their account until a better opportunity presented itself.

Our real estate portfolio included multiple Single Family Residential Flips, a commercial building (office/shop space), and a triplex in Canandaigua, NY.

Are these casement, single hung, or double hung? 

Some flippers I work with just gets a SOW from the contractors and some get inspection every single time.Typically wholesalers won't allow inspection periods so you have to just trust the SOW or your contractor or your experience.