Either because of another full-time job, like Wayne mentioned, or you took on too many clients (compared to your available time, energy level, family commitments etc).Do you not have the fiduciary duty of obedience to obey lawful instructions from your client?

They understand that w/larger value add properties they have some additional advantages such as scale, forced appreciation and easier to geographically diversify.

There are opportunities to add value in rehab properties in areas where move in ready, modern style properties are hard to come by, catch up on deferred maintenance, or chip in with a few investors to do larger deals, or diversify into other markets, or asset classes. 

Of course, if the property is in an area with a larger population, this won't be necessary.As for pictures, yes, you could hire a professional.  

This requires a larger down payment.

One negative issue with this strategy is you have to keep looking all the time to grow your portfolio esp if you want to find them at a deep discount vs with larger multifamily you get a lot if doors at once

If you're able to get into a larger complex you won't have as much competition and you might be able to show case your father's former projects to investors who will see the demand for what he's doing on higher end rentals.

Undeveloped, a short distance from a TINY town, but a long ways out from larger ones.

Larger potential payoff and easier.

Office space is another area of weakness, as there is a lot of vacant space, especially West side/ Energy Corridor.