that really stinks. whats the caveat of needing to have the survey done if you have permit in hand? are you that close to your property lines? you can often triangulate off of the 4 pins you have and come up with the location of the others, and your survey should give you some good info if its not that old. dont know about your state but the town hall keeps the latest survey and sometimes previous ones on file, I was able to use mine and establish my boundaries with a surveyors tape measure. they are pricey, average here is 400ish for a single lot so a double at 700 is about right. do you need the other lot done? cant get away with just the single?