Eco-terrorism in Seattle = Cost of doing business
I doubt ELF would have left a stupid sign so I doubt they did it but probably deserve to be punished for something else they did.
It’s probably a homebuyer who but down the cash and now can’t afford the home they bought. Maybe an MS employee who worked on Vista.
I also bet the perps will eventually get caught - they usually do in these arson things. Evidence is just too plentiful and people talk.
I think they've done it before ... at an arson of a large under-construction apartment complex in the San Diego area about 10 or 15 years ago.
You might want to do some research on elf/alf. They almost always leave a calling card. They want everyone to know when they pull these stunts. And I would not bet on anyone getting caught. These nut jobs are very smart and they have learned a lot for Al-Qaeda. They have loose knit cells and practice very good operational security.
My understanding is that they were "model" homes for showing. Wouldn't have been sold until on down the line. Also, these groups leave signs all the time. They are proud of what they do.