I have done a few BRRRR's and can tell you the interest rates have sure made the strategy very difficult to cash flow.

Landlord friendly for the most part, prices are still reasonable and rent rates are good.

Power lines? 

I wanted to confirm what you said both for myself and for other people who read this with the same question, so I did a bit of research to come up with the below example:If I make $10,000 a year from my property, do not pay myself to property manage, and I'm taxed on income at a rate of 25%, I'll owe $2500 in taxes on that, and keep $7500.If I instead pay myself through an LLC to property manage at a standard rate of 10%, I'll pay tax on $9000 at 25% ($2250).

How can i see what rates are from investment property purchases? 

Each class has different tenant pools, appreciation, turnover rates, etc.

If you are looking at more DSCR type options for a stabilized property, then you can layer in market or actual rent, taxes and insurance estimates to calculate DSCR rate.

Should multi-family investors be scared of interest rates?

Higher interest rates.Conventional: Easier qualification and interest rates.

Your best hope is that the four vacant apartments are Market Rate apartments, which I doubt.