We all have different risk tolerances and we all have different risk profiles.  

So in general, to get this kind of return, you would have to be willing to take more risk (such as loaning on your own, going into riskier loan states and types, etc).And different investors have different risk tolerances, so everyone will look at that risk/reward equation differently.

How soon are you wanting to achieve this and what is your risk tolerance? 

I'd recommend that your mom talk to a financial advisor before looking for the CPA, to have a conversation pertaining to whether these proposed investments align with her goals, risk tolerance, and diversification requirements.

Like Jessie said, buying a 4 unit property would be ideal but it all depends on your tolerance level! 

It really depends on what you are looking for, your risk tolerance, your strategy, your longer term vision . . .

Many cities greatly restrict where and how a rooming/boarding house may operate, yet will often knowingly tolerate a non-confirming rooming house - until they don't.  

But there are people making good money in the Baltimore market, it is just that the downside risk is higher than my tolerance.

The second half teaches you how to create your own investment plan based on your own personal risk tolerance, your goals and timelines, and various financial calculations such as volatility, expenses, returns, etc.

I would spend time using free tools like Zillow, Redfin, Rentometer, and public resources to gather information on market prices in the areas you would like to invest and from there run the numbers that you are comfortable with based on risk tolerance.