However, there is one other very important fact to consider and one that might help you find a happy medium of how many properties to buy with your resources and that is the proposed investment's Internal Rate of Return (IRR).Assume you have three possible scenarios and you want to know which is the best one to invest in.

As long as your husband is doing part-time self-employment activity and has no employees, he can open a solo 401k that can then also be invested in real estate.

It's a college with lots of international students, however it is along 23rd street which never seems like a keen place to be.

What kind of employee do you need for your LLC and why? 

(College doesn't teach that - it teaches you how to be a W2 employee, NOT how to be successful!)

Only exception here is companies with minimum 10 employees, and even then it needs to be very material intensive like HVAC or kitchens, not plumbing or electrical.

I didn't trust the hospital to keep my mom safe and comfortable, as so much communication is lost at shift change and many of the employees are tasked with taking care of too many patients.

I have met a real estate investor in Orlando, Fl @Andrew Davis who has been mentoring me and allowing me to essentially intern with him and gain experience.

I have no retirement...I am a 100% commission based employee. 

Cash-on-Cash return is important, but go a step further and calculate project's estimated Internal Rate of Return (IRR).