The professionals needed for development include lawyers, engineers including civil, geotechnical, environmental, and traffic, architects, title companies and surveyor.I may be telling you what you already know and I could go on and on but it would be easier to discuss one or two areas rather than explain all of them.

They make the homeowners feel better about their environmental impact.

We m got positive feedback from both the county and state dept. of environmental quality.

Besides, I thought Californians were environmentally conscious, haha.

If your builder does a poor job or doesn't finish the job, your lots are worth significantly less 10-15% of what you paid versus 80-90% of say a multi-family.I would argue that the CA housing shortage is an artificial creation posed by city code and development restrictions, environmental, etc.

If they can't find anything obvious, next step would be to visit an engineering firm and have them do a preliminary analysis.Some big questions would be whether you plan to leave the existing house, whether this is easy access to all lots, what the utility requirements are, whether it's public sewer or septic, and if septic, is there room for a septic field, etc.If the initial engineering analysis is promising, you'll need to do site surveys, a site development plan and potentially some environmental planning.

It will require annual maintenance and will always be an eyesore...however it will also be reliable and environmentally pretty sound..i wouldn’t want one by choice but they are very common and often overshadowed but the beautiful properties that house them.

Building off of what @Daniel Duku the main thing you would want to check for which you can via atlas is if the land was used previously for an auto shop, laundry mat, or something where you would need to get an environmental report.

Consider environmental problems.

I'd imagine that environmental, drainage, etc are big things to consider during due diligence.