I recently added a half bath were half bathrooms add $50k of value

At least half of the videos are probably abject garbage or gurus selling a program.

All 4 units are rented but at half as much as market value. 2 of the 4 tenants have lived there for 20+ years and one of those tenants is a hoarder and their unit needs gutted.

I recently added a half bathroom out of existing space in a very high cost market.  

 @Jason Dubon Jason, that’s awesome—you’re already taking action, which is half the battle!

But, this will be front-end weighted and gradually slow towards the back half of the year.

Given the permitting timeline, I will offer to purchase some of the furniture and redecorate the rest (so half and half to reduce some furniture building time).

The source of the loan does not matter.So yes, if you borrowed $100k and used $50k to buy B and another $50k to buy C - you deduct half of the interest against B and the other half of the interest against C. 

The combination that this niche offers first-class care to those that need it most and the potential for it to become profitable for many years to come definitely has me interested in learning more about opportunities investing in RAL.We are renting in our current assignment, but we will PCS in about a year and a half.

Consider this: there are an estimated 10K homes in Pacific Palisades, at least half of which were destroyed. 25% were constructed during the 60-70's and +/- 75 TOTAL were built in the past FIVE years.