Howling, as we did loudly in this space last week, against the dubious Falls Church City Hall contention that a conversion from condo sales to rentals at the Pearson Square project, under construction, will be “revenue neutral,” has proven useful. This week, the City Council was provided new documentation showing that, in fact, the conversion of 230 residential units the Pearson Square developers want will cost the City, in terms of tax revenue losses, a net of about $185,000 a year.