New construction condos are an entirely different animal these days. Typically, they're priced at a fixed price, and don't like to accept reduced offers. In today's market, however, even new construction has been driven to accept discounts.
You'll have an easier time negotiating "extras" (ie: granite, stainless steel, hardwood flooring, upgrade appliances, whirlpool tub) than price, because the developer doesn't want your "discount" to show up on the sale price. If others who've purchased for full price, in your development, catch wind of your discount, they might be a little irked, and the reduction of your price is public records, but the free, or discounted upgrades do not show on public record.