There are a lot of site-specific issues you need to investigate before deciding what the land is worth to you. For example, what is the current zoning - does it meet your needs? If not, is there a master plan in which the municipality has indicated a desire to have your property zoned as you'd like to see it?
Than there are off-site issues such as availability and capacity of utilities and the capacity of access roads, and on-site issues such as depth of bedrock (is it diggable or will you have to blast?), whether there's a high water table that encroaches on any underground utilities or foundations (and does that water table have significant seasonal water level variations), encroachments by roads or other improvements on your property, limitations imposed by easements or rights of way, etc. Beyond the bedrock issue, soil conditions can be costly if the property has problematic soils such as too much silt, deep topsoil, or extensive wetlands.
You'll also want to know what ordinances are going to affect your budget - things like tap fees, tree ordinances, storm water retention policies, etc.
Bottom line is that you have to investigate ordinances, off-site conditions, and on-site conditions before you can even begin to budget your development. Finding an engineer that's highly regarded locally can help slipstream your efforts.
God luck going forward!