The book of business: properties, the units in them, who occupies what today, and what is standing empty.
Address, square footage, owner, manager, and the units that make up each property, with portfolios for grouping several of them together.
One row per unit as of any date: who is in it, on what terms, paying what. Runs for one property, a portfolio, or the whole book.
The commercial view of the same thing, with square footage, rate per square foot, CAM share, and lease dates.
What is empty, and since when. Measured against real occupancy rather than whether somebody remembered to flag a unit.
The next twelve months of expirations, which is the renewal pipeline rather than a list of history nobody acts on.
Properties roll up to owners and to the legal entities that hold them, so statements and distributions go to the right place.
Calculate and post management fees on collected income, on the schedule each property agreement sets.
A manager who runs three properties sees three properties, on every list and every report.