Why it usually goes wrong
Self-managing owners keep records their own way, and outgoing managers export whatever their software produces. You then rebuild it for your own system, and the gaps show up as tenants charged the wrong rent, deposits nobody can account for and units missing because they were vacant. Asking for the details in a fixed format, checked as they're filled in, is faster than chasing them afterwards.
1. The property and every unit
Everything else hangs off the unit list, so start here.
2. Owners and how they're paid
Who you report to and pay out to.
3. Tenants and leases
What the first month's rent charges are built from.
4. Balances on the handover date
The numbers most likely to cause a dispute later.
5. Documents and the rest
Ask for these too, but keep them out of the spreadsheet.
Mistakes that lead to wrong rent charges
Once you have it, the guide to moving tenant and lease data into new software covers the import order and the errors that get rows rejected.
How to collect it
Send one form, not a blank spreadsheet
Give the owner or outgoing manager a form with exactly your columns: one row per unit, dates in one format, rent and deposits as numbers, and property types from a dropdown. Mistakes are highlighted while they fill it in, not after you've imported it.
Let them paste their rent roll
Most owners and managers can export a rent roll. They can import it into the form and fix only what's highlighted, rather than retyping every lease.
Use your software's columns from the start
If you know where the data is going, collect it in that system's format. The DoorLoop residential template downloads a file in the columns of DoorLoop's migration spreadsheet. More for property managers is on Import Builder for property managers.
Collect every unit and lease in one format
Start from the residential tenants template, adjust the columns, and send the owner one link. They fix what's highlighted, and you get a CSV in your format. Their data is checked in the browser and never stored by us.
Try the residential tenants template