The new AIA/Deltek Architecture Billings Index (ABI) for the month of October has recorded a flat (50.3) reading, ending its 20-month streak of consecutive declines.This score indicates a balance between the number of firms experiencing a decrease in billings and those seeing an increase, according to the AIA. Inquiries into new projects in October also picked up to their highest level in six months."Billings finally stabilized this month, and firms are feeling more optimistic about revenue projections for 2025," said the AIA's Chief Economist, Kermit Baker. "Overall, 41 percent of responding firm leaders expect to see net revenue growth from 2024 to 2025, with 32 percent projecting growth in the 5 percent to 9 percent range."October ABI HighlightsRegional averages: Northeast (45.6); South (52.1); Midwest (46.9); West (47.6)Sector index breakdown: institutional (50.5); multifamily residential (45.6); commercial/industrial (47.0); mixed practice (48.0)Project inquiries index: 54...