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When you add floors, this essentially add dead load to the building. Which means you need to check with the Structural Engineer first if you just want a simple add-on without total demolition / reconstruction. I doubt it'll be easy to find a Professional Engineer or Builder that will be willing to risk his Professional License given the current building code. Also, even if you can find the best builder, waterproofing the joints of extended / added floor will never be 100%. Leakage of some form to be expected. Lastly. Looking at your budget of 1 million or less, nothing much can be done. If you keep your existing floor, you will need to spend more than norm (extra cost to move in the machinery to install piles or foundation upgrade) to increase the foundation to take the extra building load. All in all, I don't recommend A&A. To all owners, please stop thinking you can just add or stack on extra floor as & when. This is not Lego. First thing will always be the foundation / piles. No point saving money if your building's foundation can't take the extra load. When building can't take extra load, cracks (structural or non-structural) will appear. The leakage will happen. Would you want to spend money this way to result in bad situation ranging from sinking leaking building (lightest) to total collapse of building (worst case). I don't mean to frighten you or anyone but you have get your concept of building right!!