The surge of US lumber prices has dropped from records for the first time in months, adding to signs that a historic rally may be ending  A benchmark of Western spruce, pine and fir lumber prices declined for the first time in 18 weeks, CIBC analyst Hamir Patel said Friday in a note titled “Lumber Pricing Decline Now Clearly Underway,” citing data from trade publication Random Lengths. The drop comes on top of a tumble in lumber futures, which have fallen as much as 30% from an all-time high reached earlier this month. Sawmills ...