Selling the subdivided land under the main home

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I bought my main home in June 2016. In August i found out that the land is subdividable. So i start subdivision process. It took 30K (survey, engineers, fees etc) and a year to subdivide (subdivision is done in June 2017). While my first intention was to build a new house for my family now i changed my mind and i'am going to sell the land in 2017-2018 and the main house in 2018 to meet 2-years exempt from capital gain. The questions are

How the IRS will treat the sale of new land in this particular case - capital gain or ordinary income?

If it's a CG then it wiser to sell the new lot after a year of holding (to meet LTCG threshold). When is the day - the day i bought the house, the day i applied for subdivision, or the day the town approved the subdivision ? 

Can i determine the basis of the new lot as 30K i spent to subdivide the land?