They also require less day-to-day management.

I'm a local broker, lender, investor, and I manage 100+ STR/MTR properties.

Does anyone have a source for spreadsheets or proformas for a multifaceted commercial project? 

I did a 100 lot project and we made a little over 10k net per lot but i did buy the land for 200k cash and spent 100k on entitlements it took 24 months..

I'm closing on a duplex in a couple weeks and I'm considering using a property manager vs. self-managing. 

To maximize cash flow - manage the properties yourself.  

definitely. i have got the details from them for their existing landlord. however, that name does not match the owner on the city tax office property records. and they have confirmed that they provided the landlord's details, not the property manager's details.I believe that should match or it is possible to not match?

Still, there are lenders who will qualify you even if your mortgage payment will not be fully absorbed by the projected rental income. 

I was even looking at 4 unit multiplex in Oakland, CA since I'm from the Bay Area so I can easily manage it myself but that place is such a mess. 

Increasing vacancy often means keeping rents low and offering concessions.And while you will sometimes see "merchant builder" developers self manage with their lean team to just get a deal ready to sell, this deal is managed by Willow Bridge, who manages 180,000 units.