You could work up your own comparables and use those.I've used all three methods for various different purposes.

I like the simple interest calc based on 365 days X daily balance vs the other methods of interest calculation. 

I want to get into the BRRRR method and I don’t know what’s the best way to start.

I am having trouble one on part of the BRRRR Method.

Don’t give up, real estate is profitable, but also frustrating at times, learn from other people's mistakes.Here are my quick tips to getting started:Watchthis video 4 Reasons Why New Real EstateInvestors FAILFourSquare Method for analyzing deals CalculatingNumbers on a Rental Property [Using The Four Square Method!]

We spend a lot of time with our investors helping them to build an over all financial strategy, learn the benefits of investing in real estate, navigate complicated topics such as; creative financing methods, tax strategies, entity structuring, 1031 exchanges, cost segregation studies, market analysis, etc. 

Originally posted by @Rachelle R.

Perhaps combine that with the BRRRR method and refi out in 6-12 months to return your capital.

Therefore, what are some challenges we may face utilizing this method for real estate investing?

Yield is a function of risk...so with DC being one of the lowest risk markets in the country, its going to have very low yields, ie low cash on cash.There is a method becoming more popular to achieve higher yields in DC and that is renting by the room.