Now I don’t mind having a partner but my question is this- I have heard Brandon Turner saying numerous times that banks will typically stop giving out loans after 5-10 properties.

Is looking for numerous single family homes in different locations better than syndicating a multi family property for a first deal? 

The numbers the current owner is giving me are good enough to leave some margin for error, and there even appears to be upside on the rents.

I already own numerous properties so, just playing worse case scenario/devil's advocate, I am assuming that after re-financing the 5th or 6th home, the income requirements will be significant.

I've used a HELOC on my primary residence numerous times to support cash offers/acquisition without messing with more cumbersome financing or partners.

The federal government and state of Colorado have numerous rules and laws to protect tenants and home buyers from being discriminated against.Here's a description of the Fair Housing Act from HUD's website: "...as amended, prohibits discrimination in the sale, rental, and financing of dwellings, and in other housing-related transactions, based on race, color, national origin, religion, sex, familial status (including children under the age of 18 living with parents or legal custodians, pregnant women, and people securing custody of children under the age of 18), and disability."

Craigslist originally, hard to find on the MLS due to listing errors.

In my local market there are numerous 3% down conventional products for single family, 5% down conventional products for duplex, down payment assistance on more than 1 unit properties, tax credits, all kinds of programs that have other ways to benefit owner occupant buyers. 

So while there's a lap pool, gym, concierge, bocce court, and numerous other amenities, there's nary a tub in the place. . . unless you count the tubs in the dog spa.

To continue from my response on #1, you can't afford to making a legal error that ends up in litigation.