1. Does this sale considered as regular sale
The sale of the property would be the sale of a capital asset. If you hold for longer than 1 year it is longterm and you are allowed the lower capital gain rates for tax.
2. Does this sale considered as investment?
Yes it could be an investment.
3. Do we need to pay an extra taxes on the profit?
You usually realize gain or loss when property is sold or exchanged. A gain is the amount you realize from a sale or exchange of property that is more than its adjusted basis. You would pay tax on the gain
If yes what are they?
This depends on the holding period. If one year or less then the rate is ordinary (same as your regular tax) if longterm holding, the rate depends on your total income and filing status. The tax rate on most net capital gain is no higher than 15% for most taxpayers. Some or all net capital gain may be taxed at 0% if you are in the 10% or 15% ordinary income tax brackets.
4. Since this is below 2 years on owning the property, does it have any complications on selling in terms of income tax..
Yes, if you sell before it is long term holding, you will pay tax at regular rate of tax. Regular rate is generally higher than capital.