You could put shelves with cloth bins on the wall to substitute.

There is no substitute for Hawaii.

There is no substitute (yet) for the human factor. 

As if this alone wasn’t good enough, he had pre negotiated a SUBSTITUTION OF COLLATERAL clause to be included in the deed of trust/note.  

I feel they are more an MLS substitute than an agency substitute at present.

I stands for inimitable and N stands for non-substitutable.

I'll continue to do some contract work (from home) that pays around $1k per month, will substitute teach at my kids' school, maybe pick up a bartending shift here and there because it's fun and nostalgic (waited tables and bartended my way through college and the first 2 years that I started my business), and will chase curiosity to find my next low stakes venture - hopefully something that I can start with my daughters - who are 7 and 10.

@Calvin Thomas fine, substitute "gross profit" for "markup"

Since the primary was purchased before 9/27/2017 and was placed in service after 2020, it is not eligible for bonus depreciation.(8)Phase DownIn the case of qualifed property acquired by the taxpayer before September 28, 2017, and placed in service by the taxpayer after September 27, 2017, paragraph (6) shall be applied by substituting for each percentage therein—(A)“50 percent” in the case of—(i)property placed in service before January 1, 2018, and(ii)property described in subparagraph (B) or (C) of paragraph (2) which is placed in service in 2018,(B)“40 percent” in the case of—(i)property placed in service in 2018 (other than property described in subparagraph (B) or (C) of paragraph (2)), and(ii)property described in subparagraph (B) or (C) of paragraph (2) which is placed in service in 2019,(C)“30 percent” in the case of—(i)property placed in service in 2019 (other than property described in subparagraph (B) or (C) of paragraph (2)), and(ii)property described in subparagraph (B) or (C) of paragraph (2) which is placed in service in 2020, and(D)“0 percent” in the case of—(i)property placed in service after 2019 (other than property described in subparagraph (B) or (C) of paragraph (2)), and(ii)property described in subparagraph (B) or (C) of paragraph (2) which is placed in service after 2020.

TL;DR: AirDNA isn’t a substitute for doing your own research!