Floor plan, please take a look!

And how do you get from the kitchen/dining room to the garden?

Your basement is larger than your street-level floor. The rooms can only be moderately assessed without seeing the furnishings.

I run a small advertising company and embroidery

This is a business and will likely require an MI or MD area; I don't see it fitting in a WR or WA.

Plot ratio 0.3 Floor area ratio 2

a floor area ratio (floor area ratio) of 2 with a plot ratio (plot ratio) --> does that mean you have to cram in 6 (in words: SIX) full stories plus an additional developed attic to make use of that?! [/B] In what kind of area are you building there?