Hello! In order to find out what a lot 100x135 sells for in unincorporated Lombard, you should contact a local realtor familiar with the area. He or she should do an Area Market Survey and a Comparative Market Survey in order to see what has sold similar to your property as well as what your current active competition is. Some key elements to consider in pricing is: your time frame to sell, what is the lot zoned for, what new construction is occurring in the area that will impact the lot's value, are there any restrictions or issues with the lot and other items that will impact the value. If you need local help, please feel to contact me at your convenience. Good luck!