We are very aware of HELOCs, HELs, Cash Out refi’s & these new “Selling off your equity” products but I’m wondering if there are any better, other or private lender options for accessing equity in your primary residence? 

There are some pretty nice discounts on many products and services offered as Perks to BP members that you might want to check out: https://www.biggerpockets.com/perks/proI really like the alerts feature that can quickly guide you to current topics that might interest you: http://www.biggerpockets.com/alerts

Or will portfolio lenders also offer this type of loan product?

Back to the original thought -- As I said, I found this position, and with my 15+ years of sales & sales management under my belt, the transition from product to service sale came easily to me.

Family products are extremely hard to find and buy in the marketplace.

Lots splits that are basically administrative you can take on debt. my current 90 home project  600k to 800k finished product we bought from when it was 2 years through the process but still took 2 more years before we could break ground..

I'd be interested in hearing what product you're using for the water sub-metering and what the expense/unit is to do so.

Here are some articles about Zigbee and Z-Wave technology:https://www.cnet.com/home/smart-home/smart-home-hubs-zwave-and-zigbee-home-automation-wifi-eero/https://www.safewise.com/blog/zigbee-vs-zwave-review/We thought this was a great article about AirBNB home automation technology and costs with a real world example: https://www.motoretreat.com/automation/And here are the technology providers:Seamhttps://getseam.com/Everydoorhttps://www.everydoor.io/KeyCafehttps://www.keycafe.com/Remote Lockhttps://www.remotelock.com/smart-locksSchlagehttps://www.schlage.com/en/home/smart-locks.htmlYalehttps://us.yalehome.com/en/yalehome-products/nest-x-yale-lock1/https://us.yalehome.com/en/yalehome-products/yale-assure-lock-and-levers1/yale-access/https://us.yalehome.com/en/yalehome-products/yale-pro-sl-yrd156yrd136/Kwiksethttps://www.kwikset.com/haloeRentalLockhttps://erentallock.com/SmartThingshttps://www.smartthings.com/SmartThings/automaterhttps://community.smartthings.com/t/release-rental-lock-automater-airbnb-vrbo-homeaway-tripadvisor-booking-expedia/124785Hubitathttps://hubitat.com/Winkhttps://www.wink.com/products/Noise / Smoking DetectionKeycribhttps://keycrib.com/Property monitoring to manage noise, smoking, keyless entry and guest behavior with real-time alerts, bonds, and contracts.Accounting IntegrationGuestRevenuehttps://guestrevenue.com/Reconciles multiple listing services with Xero and Quickbooks.Maintenance / RepairPlentifichttps://www.plentific.com/en-us/Plentific works with landlords to transform how they deliver repairs and maintenance services.

I believe the originial BRRR method was devised to buy in cash and refi afterwards because of strength of offer, ability to refi before 6 mo after acquisition, and save the extra closing/loan.It depends on how you structure your deal on what loan products you can get. 

The reason why CAP rate isn’t talked about in the small multfamily properties is because it’s not a meaningful metric on that real estate product at the end of the day the CAP rate at face value is a dangerous thing.