The simplest way is to purchase a home or land with subdividable acreage but keep it in one piece. You can build for your own needs in harmony with the land. A consultation with a Conservation Land Planner may be helpful. Information about this type of planning is available at the link below.
	Two or more people buying real estate may join together to purchase a subdividable property. This may help you to buy a larger parcel of land than you could alone. You and the other buyers can make agreements or possibly obtain an easement to prevent the land from being subdivided into smaller parcels with many more houses being built. This idea may be suitable for residential and agricultural land.
	Your search for property can be devoted to places with environmental or agricultural significance that can qualify for a conservation easement. A land trust can design a conservation easement with you that will suit your individual needs.