From my experience working with over 400 investors, financing your first deal with minimal out-of-pocket expenses is entirely possible, you just need the right strategy.

What is your price range and what do you consider to be a "medium" rehab project, rehab costs = to 25%-50% of the purchase price?

They are going to have a pool, possibly hot tub, maybe a snack bar, and be beach front. at least comparing to the PCB market, most houses in comparable prices to condos dont have those things and are not beach front.

The area of the land is 26000 square meters possibility to build on it 25 floors.

The area of the land is 26000 square meters possibility to build on it 25 floors.

Is it possible to have denser development?

In your experience, do you have a range that is charged?

I would just excavate a few 2'x2'x2' (or larger if possible) spot footings, w rebar and Simpson hardware,under the house (you will want to take up the floor to make this easier to do).

It is possible to get 90% of your purchase price and 100% rehab funded as a first timer in 1-4 units.  

I'm in a couple of funds so the range is 10-12%.