Deductions & credits

Yes, these improvements would be added to your cost basis for the sale of the land.  Land is considered investment property if it is not part of a home sale.  Land sales are reported by using the following instruction.

1. Wages & Income, then scroll down to Investment Income and select Stocks, Cryptocurrency, Mutual Funds, Bonds, Other (1099-B)
2. Respond "yes" to Did you sell any investments?  You'll then be asked Did you get a 1099-B or brokerage statement? answer "no."
3. Enter one sale at a time
4. Enter Land Sale Information 
5. Continue to follow the prompts to complete your sale
6. See the image below for assistance.