Have you gotten pre-approved with a lender? 

The process is very involved as you'll have to navigate pre-construction activities that involve architectural plans and approval from the city and then the construction activities (Shovel to soil) take anywhere from 5-9 months depending on how much your building. 

Moreover, can you clarify if the complex is already an existing 16-unit or do you intend to build it?   

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

They might not even cover it if they know it is a rental.

I would venture a guess that many investors believe that agents who cover the same territory are competitors, however as I'm sure you are aware that there is more success in collaboration as agents than competition.

Will the cash flow even be able to cover that?

Are you taking this subject to existing mortgage?

I handle St Augustine/Ponte Vedra/Palm Coast but can certainly help with Jacksonville and based on your goals there may be other opportunities to explore.To cover off insurance from previous comments, the market has changed and it is competitive with new carriers entering the market. 

I have decided to look into a heloc, I'm a bit newer into realest state investing, I have completed a couple of fix%flips this year, I currently use hard money for the purchase with 10% down and I cover 100% of the rehab, with that said even just doing a couple of homes at a time, I find myself around 200k out of pocket, I think it would be a bit easier on myself and wife if we utilized a heloc vs just cash, my primary should appraise around 1.1m and my mortgage is 640k, I'm looking at pulling about 250k for a heloc, I don't want to refi the home and cash out as I only want to pay interest on funds as I use them ( I know I won't always be using the heloc cash) Any advice or even knowledge for people in a similar situation, and anyone have a referral for a Heloc?