I’m currently working towards another rental property (duplex or larger) but I know I still need funds.

For larger properties, some of our clients run another cost segregation study at the time of sale.2) Partial Dispositions - Taxpayers can carve out and dispose of components removed or demolished from a building.

Also make sure to build on a property located in a desirable location with larger pop density and if holding for rentals, charge median rent for that market as lenders want to see a bigger pool of buyers/renters available to occupy/sell. 

I've had them long enough to keep pushing up rents so that I am at the top of my niche, but know not to exceed it because I'm just about at the point where if I raised rents another $50-$100 I'd be crossing over into the lower end for larger units.

He has an online network called Financial Friends Network.

Between the MLS and my network/driving for dollars, my deal flow has been slow lately.

NETWORK!!!

I see some larger single family homes in areas that appear to be zoned R2 that, at least from a physical perspective, seem like they could work for this.

Larger brokerages sometimes are in need of administrative work, which could earn you a steady income while also getting exposure to the field. 

I’ve had most luck with signs in front of my plaza and word of mouth - networking at Chamber of Commerce and chatting with other business owners in the area.