. >> just like delores street has pine trees -- palm trees, we have defined our major thoroughfares with particular species and that's actually considered to be a good design feature, urban design feature. >> it helps, one of the reasons why when the city does maintenance on a street that we have these major thoroughfare, then we can sure the prep yet trees are planted. if there's a problem with the species, we hope to keep up with the literature and learn things, so we can have plans for the future. >> how is the health of this generally, this array. >> this is pretty good. >> generally? >> generally market street looks good. even on market street where they have big, mature trees, they get hit by cars, every once in a while you'll see a smaller tree, we're planting with the same species. >> right here at the next tree -- street we have a smaller replacement tree. >> that's right, that has probably been in the ground for ten years. we have smaller ones that we put in recently we, try to stick with the same pallet. >> what about the trees over by city hall. >> those are the same species