Hi, Jane. Some of your situation will depend on local regulations (as always), but I would think you could handle this scenario by subdividing the 2 acres off as a building site but your son still keeps the land in his name. In other words, there likely is no need to transfer the property to you at all (unless you just wanted to do it that way). If he keeps title you also may avoid incurring unnecessary taxes, transfer fees and other transaction costs. Check with a local real estate attorney, and good luck!
Comparables for land can be trickier than for home sales in your area. Although the assessor's valuation on your taxes can provide a starting point, consider factors like whether your property has utilities to the property line, views, zoning and any preapproved building plans to determine its worth. Location is always one of the most critical factors. In San Francisco's Pacific Heights area, for example, a buildable cul-de-sac lot of less than 4,000 square feet can sell for more than $9 million.
Once you get over about an acre in size and two or three lots, the complexity of the subdivision process can rise dramatically. The level of difficulty – and expertise needed — can be compounded if you have a site where lots will not front on an existing public road or where utilities and infrastructure must be built. This likely will require you to undergo municipal oversight (possibly even state or federal, for some situations) for the subdivision’s site design and layout, as well as construction of roads, utilities and other infrastructure. In this scenario, you basically are stretching the activity from simply subdividing a parcel to full-scale community and land development.