I've read post where people say $500-$1,000 but that seems to be for single family houses and for the finder to just find the deal, not broker it per say.The deal.It is a 32 unit apartment complex 3 buildings.

I've been investing in 1-4 unit investment buildings (buy and hold) and recently have begun to look into apartment complexes. 

The SFR are maintaining decent value and there is a lot of mfr and a couple larger complexes in this area.

Deduct for Insurance, Taxes, Capex, Maintenance, Vacancies, PM, etc.Relying on Equity build-up in your Duplexes for the down payment on the Apartment complex could be problematic.  

My thought on your option B is that a good deal on small complex apartment in Houston is very hard to come by.

Much less liability and complexity.

After a few more years, I would sell the complex and use the profits for a large ~75 unit apartment complex.

I have learned 11 years in that the less complex or EXOTIC you make something the MORE of a chance it actually has to close.I like vanilla deals.

So you keeping raising your price until your work load evens out or drops off slightly, then you back your price down a bit until you find the sweet spot.

We own 16 condos in a complex in Santa Fe, NM.