We closed on a four plex in April, followed by a 62 and 67 unit with the same agent.Why is this “small” 33 unit life changing?

Similarly, if you put all Class D tenants in a Class A 4-plex, what do you think will happen?

That said, if the property you're attempting to finance is materially larger than the properties you currently operate (IE - you're trying to finance a 30 unit building, but have only operated a series of 4-plexes to date), then sometimes this rule gets thrown out the window and you'll still be subject to the "Limited Multifamily Experience Sponsor" re-sizing parameters. 

I'm under contract to buy a 6-plex at around 60%-65% of its actual market value.

I've been buying and holding for SFH's rentals for 15+ years, but my goals now are Cash flow (70%) and Appreciation/Equity (30%) so I can invest faster/grow more in shorter periods of time.I ran this: View report on BP as a really rough test for investing in this property (3-plex, but also offers an attached 3-plex for consideration). 

Similarly, if you put all Class D tenants in a Class A 4-plex, what do you think will happen?

Going to go for 2 years and my starting salary will be around low 200s should I go all in with a 4 plex or just start with a duplex like you said to?

Similarly, if you put all Class D tenants in a Class A 4-plex, what do you think will happen?

The property types I'm most interested in are: Small (2-4 plex) and Large Multifamily. 

I am under contract for a 5-plex which is technically a commercial property.