Developing is a high upfront cost business.

Generally speaking you will be able to get 80% LTV on a cash out refi (as long as credit is decent and property doesn't have any super unique qualities).

I highly recommend reaching out to @Allen Duan

Prices for whole buildings will obviousl vary based on age, size, location, but they are fairly high IMO. 

It is in an area where land is high valued and scarce.

Obviously, I don't know anything about your finances, so for all I know, you may have a few million in the bank, and this project is just a fun experiment that wouldn't even be a drop in the bucket if it all turns south...but, regardless, you'll want to model out what would happen if this project crashes and burns...As you may know, managing a rental in a D to F area (or even a C area) is usually not recommended (for many reasons), and funding a rehab with credit cards is also usually not recommended (again, for many reasons). ...even highly experienced investors often won't touch anything lower than C grade because of all the difficulties of managing and re-selling them...If you're dead set on rehabbing the place and keeping it, I'd strongly suggest studying up thoroughly on the local rental market and tenant pool (e.g.; rent medians and lower and upper bounds, typical days on market before securing a tenant, local vacancy rates, tenants' typical income, education level, employment opportunities, credit, and rental history).

Demand is still insane with net migration upwards of 250k/yr for the entire state of Florida, Miami is a big chunk of that.Good luck on the pitchThanks for the comments....According to Miami Herald reports July 22, 2021, "Miami-Dade and Broward are the only counties in Florida that require aging high-rises to get reinspected once they hit 40, and every 10 years after.

If your all-in cost to build for below market value and you are able to place quality tenants, then you should be able to leverage the completed project in a way that allows you to pull out some of your initial investment tax deferred to fund future investments while keeping the rental income and future appreciation.I am a CPA by day and advise many developers on tax strategies.

If you have no track history I would park most in a high interest savings account or in a passive vehicle.

Is it feasible to be cash positive considering the high interest rates?