Of course, you could get a bank loan and use the HELOC as a downpayment, but you need to be careful the property still cash flows with that much debt attached to it (or allocated to in the case of the HELOC).

This is our first BRRRR so we are still working out the numbers and how much to allocate for each of the main expenses like Vacancy, Maintenance, & CapEx. 

Say you buy a $4M apartment complex and allocate $1M of it to land.

It is my view that the duplex when properly allocating for maintenance/cap ex is not going to have any income this year. 

If its all in at 10% COC or 20% its up to you.Maybe you say you will allocate 70% of the funds so you have 30% in reserve for the next great deal.

The Treasury Dept just announced that 89% of the funding allocated to states for rent payments has yet to be released by the states.

Within my REI business I have spreadsheets for each property to track direct costs and another for  general business expenses like education, office supplies, BP membership, etc that is allocated between the properties at tax time.

The idea is that this allocation would not be your main income driver, but it would balance off the public markets when they were doing badly.However, in my opinion a lot of the advice was skewed by the fact that the majority of traditional advisors only understand and know about public markets and many of them know nothing about directly owned real estate.

little do they realize how much it can cost.Anyways i am starting to look into smart water metering so i can divide the quarterly bill and allocate it towards their water usage. 

You should look at your whole financial picture, create an asset allocation strategy/plan, and then determine if you should invest the whole 300k in real estate.