From the Appraisal Writing Handbook, Chapter 1:
Take the time to make it short.
Producing a report that is succinct, yet thorough, takes much more thought and careful editing than preparing a long, rambling report. Long, theoretical introductions on various approaches and valuation procedures are readily available to anyone who wants to use them. Similarly, any chamber of commerce can provide an appraiser with tomes of data about a region or city. Using such material will “bulk up” an appraisal report, but is that necessary? Many clients would respond with a vehement “no.” In fact, the recent popularity of summary reports is, in part, a reaction against voluminous reports full of information and verbiage that clients neither need nor want to read.
Some of the property descriptions posted earlier are very well written, but why would you write half a page on the subjects siding, roofing, foundation, age, etc.. when you have already perfectly descibed these features on the first page of fannie form 1004 (if you happen to be using this form)?