1: Are the assets in the east London area or is the company disposing of them in the east London area. Are the assets or the prospective buyers there?
2: Is each asset valued in that range, or is that range the total value of all of the assets? (Because you said "value" rather than "values," it appears to be the total value, but you might change "book value in the" to "with a book value totaling in the" to make it absolutely clear.)
[I edit copy and have tutored college writing.]