Are you aware MF in CA are rent controlled and under market rents can be difficult to raise to market rent.Brrrr virtually universally is cash flow negative after the high LTV refi to extract investment.  

For property managment I've been using UnitHub lately - its got some AI features that help with lease extraction and categorizing maintenance requests which saves a bunch of time.

I can add value that could allow me to extract all my investment, but I would have large negative cash flow after the high LTV refi rto extract my investment.I recognize not everyone has an up to date profile (my profile does not include my last two acquisitions) but not one person that posted that brrrr are still a viable option has a single brrrr in their profile.  

I currently own a single family home and can extract ~ 160K in equity via a HELOC. 

The cash flow kept me safe and gave me freedom, but the appreciation runs, when they happened, allowed me to extract equity, redeploy capital, and scale faster.

you must add significant value in order to extract your investment.  

The expense tracking and categorization is solid, and they have AI features that automaticaly extract key info from leases which saves time when onboarding new properties.

A Wholesaler, a tried and true Wholesaler, brings 0 value, they only extract.

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

You have to be prepared to really push yourself to extract the maximum potential value.