One of my brothers is developing a large 68-acre parcel for multi-family dwellings. He did an interesting thing to protect the existing trees on the site during the grading and infrastructure phase. The tree roots are surrounded by fencing. The fence has a sign on it listing the appraised value of each tree. Most trees cost more that $15,000.
If no trees are damaged during the 1st construction phase there is a $100,000 bonus paid to the contractor.