That is an interesting looking parcel – I work in Environmental Consulting and I agree that the most “likely” buyer would be a developer planning to use it as a mitigation site – even just a preserve area to offset development somewhere else.
The site does look big enough that you could “potentially” have enough area onsite that would be left open to satisfy the ACOE and CDFG (assuming the open areas were permentantly set aside as open space). Any building would most likely not impact the stream channels, which helps. I think for this parcel the Coastal Commision would be the biggest hurdle. Those observations are based only on looking at the onsite resources though, not accounting for the need to bring in utilities or gain access. Not an inexpensive project, that’s for sure.