I originally bought this 40 unit apartment complex in 2021 in Nw huntsville, Alabama and since then we've maintained a sub 10% vacancy rate year over year.

If your rate was locked, then yes.If your rate was not locked, then it depends.

HELOC until the rates turn around in a year or two.

A fully paid off property which now should be worth at least $300K with appreciation, I can access 75% of that with a cash out refi so roughly $225K - refi costs.To me, its a no brainer to do bi-weekly IF you plan to keep the house for that long AND you do not plan to refinance (rate or cash out).

In my experience (but mind you as a service provider) these types of properties are usually higher rated and better overall.

It allows me to meet amazing people and help other business owners succeed.I think Real Estate will do the same!

Because interest rates are higher than before you're expectations on the strategy might have to get adjusted and be more creative in the acquisition. 

Finding a cash flowing property in San Diego is not easy, so this is a fairly rare opportunity, and I can self-manage it.Because I am closing soon on my new house, I don't have as much time as I'd like to meet equity investors the traditional way (meet ups, networking, etc.) and am looking for something fairly quickly.

I was only doing handwritten since I have the free time and I constantly hear that handwritten has a higher reply rate, but I'll definitely do more research into professional letters for my next round.

You could pull out $150,000 via a HELOC at 8% interest (about market rate right now) and the monthly interest only payment would be $1,000.