If you are building a longer term CAPEX reserve, then consider a few strategies... 1.

Is there more than one unit in that building? 

For newly constructed, purchased or renovated properties and also retroactive generally over the last 10 years, building components are properly classified into individual units of property and accurate recovery periods for computing depreciation deductions.

I use them in just about every flip and even some new builds depending on the price point.

I’m working with a group of architects that specialize in ADUs. If anybody in the Atlanta area wants to talk about adding one to their property let’s talk. 

Plus they are getting super expensive to build.

Surrounded by deals, build up your arsenal so you not only have the knowledge to take action, but the resources both from a capital and a human power standpoint to capitalize on the situation.

I've been thinking of purchasing a lot to build a 3 unit building made out of shipping containers.

I do believe that folks do spend to much time trying to build a core 4 when they need to build a core of cash so they can actually transact.. 

What you need is the source-data, a programmer to build you an app based on this data, and a experienced developer to instruct the programmer on how the algorithms/functions should perform these actions so they are actually useful.