If he puts all the money do I get a certain percentage of the equity ?

They are paid off a percentage of invested assets so it does not behoove them to recommend investing in real estate. 

My prop mgr recently told me that the community feels like a ghost town - many units are vacant and a large percentage of those have just been abandoned by owners for foreclosure or short sale.

Board members change, owners change, and the economy changes - all of which can change the owner occupant percentage, the HOA's financial health, etc. 

You could then return a good percentage of the investor capital, thereby appeasing them, and hold the asset for long term cashflow.

Typically you need 25% down for an investment property and your rate is going to be higher even if the loan is in your name, usually a full percentage point, at least.

They charge a percentage of the savings.

Can someone explain to me the different advantages and disadvantages of working at a brokerage with a percentage based commission vs flat fee?

HAHA ain't no way.On a percentage basis, you can more easily increase rent on self-storage as compared to an apartment. 

Not big numbers, but a significant percentage increase, so that's why I've been pondering this.Any insight you may have regarding this would be appreciated, but in either case, thank you for reading this little lengthy post!