Move property data from spreadsheets without losing control

Migration does not begin with uploading a file. It begins by deciding which source is authoritative for each data type. Units may live in one sheet, leases in a folder, and collections in an accounting tool. Map every source, owner, and last update, then resolve conflicts before conversion.

Clean data with explicit rules: consistent phone and email formats, stable identifiers for buildings, units, and customers, duplicate removal, and separate fields for combined values. Do not bury uncertainty in a notes column. Ambiguous data needs a business decision, not an importer’s guess.

Pilot with a sample that represents easy and difficult cases: active and expired leases, vacant units, partial payments, and attachments. After import, reconcile record counts, financial totals, and the links among unit, lease, and customer. Success is not a completed upload; it is a result that matches the approved source.

Set a cut-off for edits in the old system, define the transition window, and assign reviewers and approvers. Keep a recoverable archive and a log of corrected exceptions. Train the team on day-one workflows rather than presenting every feature in one session.

For two weeks after launch, watch for incomplete records, work returning to spreadsheets, and repeated questions. Fix the cause in the workflow or training. A successful migration does not copy disorder into a newer tool; it creates one source the team can trust.