Developers who hope to woo a federal agency to the Naylor Road Metro station in Prince George’s County are scheduled to go before the county planning commission Thursday in the first of several steps before the project is given the green light. Proposing 1.6 million square feet of office space on nearly 15 acres, Arlington developer Ironwood Realty Partners is building big in the hopes of snagging a federal tenant for the space. Naylor Road is one of four sites that county officials are highlighting as prime federal office space.