I found a solution using a post from Lacerte: Lacerte Aggregation of Business Operations Section 1.199A-4. I apologize that I do not know how to add a link to the solution....I'm too new of a user in this community. I can't even find my original post. I started at Product Help > Lacerte....and searched from there.
After I found the above solution, I received a 3/27/20 reply from someone in the community, but can't tell who (may have been itonewbie, but not sure). It was an alternate solution, with slightly different results (did not generate Schedule B of Form 8995-A). I'm assuming they both work, but am going with the one that generates Schedule B.
Assuming you are referring to Rev. Proc. 2019-38, which provides a safe harbor to "treat all similar properties held for the production of rents... as a single enterprise", that is not an aggregation that is made in accordance with §1.199A-4 and is, therefore, not subject to the disclosure requirements under subsection (c) of the regulation.
Since such aggregation is not reportable on F.8995-A Sch B (pursuant to §1.199A-4(c)) and the safe harbor election is already subject to a separate set of disclosure requirement, box (c) does not need to be checked.
Still an AllStar