When considering a Cost Segregation study, here are a few things to consider:https://www.biggerpockets.com/forums/51/topics/1206189-cost-...Feel free to reach out with questions!

If you study the economics of this industry, you'll see that it's very much like a sports team.  1% makes most of the money, then a small 2nd tier of agents do some transactions and a majority of the rest do nothing. 

Quote from @Homero Matzenbacher: Hello Everyone, My name is Homero I am a student at IU Kelley School of Business studying finance.

Based on the value of a property you can likely get away with a inexpensive desk top study such as condos and you will require a more comprehensive engineering study for larger properties like a 4plex.Desktop / modeling options are sometimes good for smaller residential like you mention. 

STRs require more hands-on management, but it’s a viable option for reducing your taxable income without needing REPS.You might also consider a cost segregation study to accelerate depreciation on the rental, creating larger upfront paper losses.

This year is the first year I will qualify as a real estate professional and be able to take some aggressive deductions through things like cost segregation studies.

@Sean Nava  If you haven't considered a cost segregation study yet on any of your investment properties, you are leaving a lot of money on the table.

We have about 100 BRRRR examples and case studies we share with clients. 

Study landlord basics, especially on what to include in your lease (going forward you will ALWAYS have a written lease).(2.5 Learn from mistakes and don't repeat them.)

If you haven't done so, you may want to get an estimate for a cost segregation study on these units.