I've had no trouble attracting interested "investors" however, they always low ball me.

I’m considering making significant changes to my condo ($$$) so that I am able to attract and serve the needs/desires of this market segment.

There are many attractions and fun things to do and over the last 2 decades, the diversification of jobs has gotten much better. 

Is the attraction to the other house worth $400K?

The deal was attractive because your building has 18 units and they were able to purchase 9 to start.

What you will find is that there are more duplexes that will attract professionals as tenants than four families: moats have been built as affordable housing in clusters and are typically 1 or 2 bedroom units.

Instead, it's all the other jobs that are attracted to northern and western Denton county that would be your rental market. 

However, my understanding is that if the investment property is not our primary residence, the financing will not be as attractive. 

E.g. in our latest deal in NW San Antonio, the market s very attractive but the existing ownership decided to self-manage and completely messed up everything.

However, my understanding is that if the investment property is not our primary residence, the financing will not be as attractive.