I never went past 15 floors, and even then I never went past 8 practically, the other 7 were went I was making a shit ton of money and just needed a dump into it.
So it the end, with 10 million in the bank, I just built a massive tower of offices all the way to the top and planted my CEO there, filled with paintings and a vending machine. Then I waited for it to end.
Did it first try after a playthrough a while ago in 3 days.
The main bit of help I can give is to just try to do as much as you can on the first and second day. Your main purchases should be the 3rd radar (Very important!) and then a very healthy amount of fuel. Put the rest in height/width and then the last remaining money into the thrusters.
I made it to mars with almost no fuel and it was pretty highly upgraded, so be conservative.
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