Particularly in popular neighborhoods and areas where undeveloped space is limited, purchasing existing property for the sole purpose of building a new structure on the land is fairly common. In many cases, developers and building companies will redevelop multiple properties in a neighborhood, knowing buyers will eat up new, bigger homes where midcentury ranch houses once stood.
I might add that in some development-friendly communities, the city and developer might try to play the eminent domain (condemnation) card. Ostensibly, eminent domain should be used only in the exercise of public good such as a new highway or road widening, though some cities get away with it in dubious circumstances. Your agent should know whether this could be an issue. Such a scenario, as unlikely as it is, would probably force you to hire a lawyer to get a decent price.
A farmer may want to expand his or her land, and your 3-acre lot is perfect for grazing. If you have land that is in a residential area, your neighbor may want the opportunity to have a bigger property and will buy your land for premium since it is adjacent to their land. And these are people you probably know and trust, which makes the entire sales process more pleasant.
Even if you’ve confirmed that there are no restrictions that forbid subdividing the land (or make it unfeasible), you and your experts also should research the local zoning, subdivision and development laws so that you can understand the layout and size limitations for your planned lots. Each county, city or other authority will have its own regulations that describe important items like current zoning requirements, minimum lot widths, setbacks (front, rear and side), buffers, building heights, required open space and other significant details that affect the size and layout of your lots.