Posted by Dan (TX) on October 11, 1998 at 18:55:19:
I use Marshall & Swift in my appriasal practice. It is a national cost survey with area multipliers. Any time you use linear type averaging you stand the chance of being very wrong. If you need a quck rough guess, it can be a start, and their methods of approaching the costs can be a good learning tool. But as soon as you can, to go into your own market and develop your own costs would be my suggestion.