The scattered-portfolio problem
A twelve-door portfolio in this region can easily span Harris, Fort Bend and Montgomery Counties. That means three tax jurisdictions, potentially three housing authorities, three sets of local code enforcement, and a great deal of driving.
Firms optimized for doors-per-mile handle this badly, because it is the opposite of what they are built for. It is, however, exactly what a buy-and-hold investor's portfolio actually looks like.
One manager across all of it
The value is not just convenience. It is that one manager who already deals with all three counties' authorities and inspection regimes does not have to learn each one at your expense.
Reporting that works at portfolio level
Per-property statements, and a portfolio view. Owners at this size need to know which door is dragging — and it is usually one specific property, not the portfolio average.