I'm also looking into a DIY cost segregation approach for 3 duplex properties that I will be closing on in the next 45 days. As a licensed CPA I know enough to understand that cost segregation studies are a very specialized product that require, at a minimum, industry specific cost and engineering data support which can only be acquired through experience and a history of completing such studies. This has led me to search for firms specializing in the niche area of cost segregation for lower value rental properties, and what I found was firms who are using internally developed software which allows for such cost/engineering data to applied to basic parameters of a specific rental property to come up with a lite cost segregation report for lower value properties (depreciable basis >$500k). So far I have found 2 firms that provide such a service, 1) KBKG and 2) TitanEcho. Both of these firms offer cost segregation reports, generated from proprietary software, for $400 apiece, however KBKG offers complementary audit defense while Titan audit defense is extra. The return on such a relatively small investment is a no-brainer because of bonus depreciation, however I am curious to see if anyone else has tried or heard of these firms or others providing similar services.