@Priscilla Sanpraphet I've developed land for single-family, duplexes and for small sub-divisions. What all types of residential development have in common is the due diligence and planning process on the front end. Typically before the land is purchased, I advise buyers to perform all of the due diligence starting with the zoning and development code to know what is even possible within the confines of the existing zoning with the city/county. Let's assume for a moment that townhomes are an approved use for your property, I would want to quickly determine the availablity of all necessary utilities to service the property. If you don't have water, sewer, and power at the property already, it will substantially limit how many units you could feasibility build even if 100% of the land was otherwise usable. This leads to determining how usable the land is. Ordering a full topographical survey of the property (which will be required for future development and application processes anyway) will give you the ability to show engineering/design groups what you have, and they can give thoughts and bids leading to a site plan. You referenced potential wetlands, so having a wetland delineation report completed would be imperative, showing any potential critical areas on the property, setback requirements, etc. which all feed into the usable area of your property. Once all of the above is known, and you have a preliminary site plan showing how many lots (and the size of lots) are available, you can start putting together numbers on the cost of the whole project. There will be the soft costs, like planning, permits, infrastructure, utility extensions, roads, etc.. Once those are completed you'll have finished lots that either you can build on or you can sell to a builder directly for them to finish. You could also look at selling the "paper lots" in advance of building out the infrastructure, but that depends on your financial ability to take this from dirt to finished product, and ultimately for holding long-term if that's the goal. Hopefully, you have a team of trusted advisers walking you through this process from start to finish. Paying a professional to help guide you through this process is VITAL on your first several development deals. It's costly, takes time, requires a specific process to be followed to the letter, and it's not for the faint of heart. There will be issues to overcome, like every other development in Washington, but with a good team, plan and time, you can get through it. Feel free to reach out if you have questions.