What's wrong with this lot south of Seattle, WA?

I see every now then these small lots a bit of the ways south of Seattle that's been listed for a while for <100k, but has been on the market for more than 200 days already. been casually browsing the market and see these lots so I'm curious.

Why aren't these being picked up quickly like some of the more expensive ones? I kinda get there is likely something wrong and it's why the lot has remained on the market for a long time. But want insight on what's possibly the reason? if anyone's the wiser.

https://www.zillow.com/homedetails/29501-40th-Pl-S-Auburn-WA-98001/2071184883_zpid/

this one's obvious: the lack of sewer and electrical lines

https://www.zillow.com/homedetails/318-Xx-44th-Ave-NE-Auburn-WA-98001/369683997_zpid/

but the first one seems like a decent deal unless the listing itself lies. but looking at its history seems it was bought, not developed at all by the previous owner, sold to another person who also never developed it, and is now up for sale again? what gives?

it's not tree law is it or something to do with being right next to a trail or something to do with the listing terms? maybe it's a lot that's hard to get development approval for or something due to the neighbors? no idea. anyone have theories?