Assessing defends methodology as council presses on downtown office values and timing of reassessments

Commissioner Nick Anello told the Ways and Means committee that Boston’s assessing process is built on a computer‑assisted mass appraisal (CAMA) model and statutory rules that require using sales occurring in a defined time window to determine values for a fiscal year. "Assessing is a backwards‑looking process," Anello said, noting that values for a fiscal year reflect what properties were worth on the January 1 determination date used for that assessment cycle.

Councilors used several examples of high‑profile sales that post‑dated the assessment determination date to press whether the department had failed to spot declining office values earlier. Anello said the department tracks sales and updates data, but also highlighted practical limits: "There is no obligation for anyone to let assessors into their homes," he said, citing how data gaps can force reliance on listing services and field verification.

On parking‑space valuations and neighborhood differences, Anello explained the assessor’s modeling adjusts for location, ownership configuration (for example tandem vs. side‑by‑side spaces) and neighborhood sales patterns. He said the department supplements MLS sales data with registry‑of‑deeds filings, field visits and an annually updated street‑view imagery program to validate attributes. When errors are identified, the abatement process is the primary correction mechanism; Anello noted abatement filings remain a small share of total parcels and most are resolved within statutory timeframes.

Anello agreed to provide further data on abatement counts and verification processes on request. He also said expanding local senior exemptions (Clause 41D) would likely be administrable with current staff if the Council and Mayor authorize changes, but public outreach and application updates would be required.

Next steps: council members asked Assessing for additional documentation on abatement volumes, samples of field verification and clarification about which sales will be reflected in FY27 assessments once the department completes its modeling.