Typically pricing is based on the number of building's, size, age, type usage, and the needs of the client. From there you can build the scope of the inspection and price it from that. This approach is regarded as being the simplest and the most common method used for commercial building inspections. Costs for office space, warehouses, manufacturing facilities, and retail, versus apartments, condominiums, and other multi family types of structures will vary. Sticking between 10 cents and 30 cents per square foot is a fair rule of thumb for commercial inspection rates depending on how involved you want the inspection to be and the needs for specialists. Then add for other needs you might have such as Environmental or WDI etc. Also note some pricing variation may occur between Massachusetts and Connecticut or Boston versus Hartford etc.