Land Development Deals Sale Of Real Property (part Of Residential Property) And Tax Liability?

Sale of real property (part of residential property) and tax liability? - land development deals

Investors want to buy many of my "earth (and my neighbors) in the yard to build a housing complex on. M 'consideration, but I would agree with them, where they develop the country but wanted to keep the land behind my house, to sell the game in the future.
What is my tax obligations if: 1) I sold to keep the flat on the floor by a lump sum and 2) if I sold the rights to develop the country, but the land is available now.

Any help or direction is appreciated!