I spoke to a few realtors on the topic and they voted against it due to city regulations.

They operate under the same regulations.

They are a licensed real estate agent who typically works the buyer leads that come in off the numerous listings of a high achieving listing agent. 

If that's the case you need ot see if there is a provision in your lease that requires they follow all local codes and regulations in which case the city's requirement should be enough for you to pressure them to do it.  

Ultimately this is just a numerical approach with a medium degree of guesswork involved, and there are definitely other factors to consider outside this scope.

Rule and regulations changes. 

She has helped numerous clients of mine with their 1031 exchanges, and honestly when you get into the weeds it makes sense to go directly to a professional to get advice.

If you want to manage properties that you don't own, then you'd need a license.You'd benefit from connecting with other landlords in the area that you do business in so that you learn the local regulations and requirements. 

Keep in mind that rarely, and I mean rarely do rental housing regulations ever come down to the size of the owner's portfolio.  99% of regulations will correspond to the number of units in that property not the total number owned by the investor.

There are numerous ways to build such platform, Joe Fearless is a great example.