Building a duplex house plan is a good way to start small in multifamily housing. The blog Guide to Finding Your Duplex House Plans is helpful in selecting your construction plans. http://www.houseplans.pro/blog/post/finding-right-duplex-house-plan

As i told you i need a garage in ground floor for car parking n all from their stairs to (first floor) i.e, living room. I dont need stairs to b fully curved it can be curved at starting, if not possible straight is also OK. In first floor i dont need space in front. It can directly be main door of living room. There a kitchen, bedroom ( not a master bedroom just a bed and a wardrobe is enough ) with attached bathroom and small storage room ( storage room can come below stairs ). I want my living room to be big i dont need anything there just a sofa n TV set as i showed in the pics yesterday. As the living room becomes big i want little bit curved stairs not full curved just curved at starting. Then in (Second Floor) the master bedroom with attached bathroom, walk in wardrobe and small room for gym. I want round bed it is OK even if it is not near window but TV set should be opposite to that. Then to (third floor) a big party hall nothing else and finally to the terrace.

is there anyway you can share your phone no. or email id to me..9426161084, i may provide you with some perspectives.......interior and architecture - space layout and exterior view.

Yup, in this case it is possible. But: - - having a proper walk in closet is hard - guest toilet will have to serve as common for living area. - average bedroom size would be around 12'X12'. - If there is staircase it will also take around 60-70 sqft area at least. - Please Note- Around 20-25% of total built up area is just wall area. So like if your house built up area is 1000sqft then the Carpet Area( the area which you will be able to see and use) is around 800sqft. Also, it depends on your lifestyle also, the way you live as it is a very subjective thing. For some people 12'x12' bedroom size is more than enough while some prefer having a 20'X16' bedroom with 10'x8' walk-in closet. It would be better if you could provide layout of the land and other information, there are many other factors that need to be consider for any house design. :)