Frist thing is finding out what the immigration office point of view is about what you are planning to do because some of them will not except it even though its within the rules, they make their own rules
Best bet is book a hotel then you can just get on a plane and then you will get a 30 day holiday and then you can go to immigration and they will give you 30 days more, you can cancel the hotel and go to your condo, when you go to the immigration you can also ask about your condo ie the information you have to send to apply for your holiday in the condo
If your going to Bangkok immigration office then you will need to take your bank book and the letter from your bank confirming that you have not dropped the money below the
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I had to do it yourself, I was not happy with the immigration because they don't tell you until the day you arrive