These two Eucalyptus appear to be the same species that are dying all over the neighborhood. In the past year, on Corralitas alone, several neighbors have had to cut down a half dozen similarly large Eucalyptus of the same species that died suddenly, They are a fire hazard and if you have more than one, it seems to spread to your other Eucalyptus of the same species.
Consult a certified arborist if you Eucalyptus are starting to die. If it is disease, pests or fungus you can spread it to your other trees (often other types of trees - not just Eucalyptus), depending on what is causing the problem. The megadrought is making trees more susceptible to all sorts of problems.
For the past week we've been looking at the dead Eucalyptus around the Red Car Property neighborhood. Click here for all our dead tree posts.
UPDATE 8-22-15: Both trees were removed by owner this week.