Congratulations on having a neighbor that is potentially interested in working together!
You have several options.
Visit citybldr.com and enter in your address. You can then request a sell together analysis that will provide an automated assessment on if you might get more value selling together.
Contact the CityBldr Team, and we will work with all interested parties to educate you about your options. If you decide you would be interested in selling together, we will work with all parties to educate you on the process of selling to a developer, and also work with you to identify a timeline that will help everyone achieve their goals. If interested either email firstname.lastname@example.org or call 877-822-CITY (2489)
We look forward to helping you understand about this unique opportunity!