Smaller units are much easier to rent though since there are fewer options. 

The danger of relying on Airdna data I guess.

If all things are equal definitely get as many doors as possible, but don't forget to consider other things and also don't take a property with more doors if it is less profitable than one with fewer.

Never invest in any city on Neighborhood Scouts' list of the 100 most dangerous US cities - https://www.neighborhoodscout....Low operating costs - High operating costs can turn what appears to be a profitable property into a money pit.

Does the proposal only apply to corporate landlords or also Mom and Pop landlords,  who  own say 4 or fewer units,  in its current form? 

Higher leverage means higher risks, higher monthly fees and fewer equity means that you are just one bad shock underwater, so that is another thing to balance. 

We have fewer people on ventilators and no new deaths.

Rehab is a lot easier and cost effective.I like BRRRR-ing SF homes and have done that for over a decade; all of them were built in the 1960s, most of them the same floor plan and layout, so we have prettyb much a system and a material list that we use for the majority of the work, which really cuts down on planning, picking and choosing - fewer decisions to make.

@John RinggoldFor rural property, "visibly evaluate and determine if an outdoor area has changed or become uneven, unstable or dangerous BEFORE using it.

(Using words like "all" or "never" or "always" is dangerous, hence only 90% certainty -- I do not have all 8,000+ pages of FNMA/FHLMC guidelines memorized.