# Mason Diner (Cafe Mason) > This vibrant diner near Union Square offers a friendly atmosphere and efficient, knowledgeable service that caters well to gluten-free needs. The welcoming setting and attentive staff create a comfortable experience for those seeking gluten-free dining options. Source: https://www.atly.com/gluten-free/location/Mason-Diner-Cafe-Mason1 - Address: 320 Mason St, San Francisco, California, 94102, US - Phone: +14155440320 - Website: http://masondiner.com/ - Google rating: 4.3 (2605 reviews) - Tags: Delivery, Kid Friendly, Lunch, Dinner, Unverified, Brunch, Breakfast, Pet Friendly, Open Late, American ## Good to know (gluten-free) - This place gets crowded in the morning. - Prices are reasonable for its location within the city. - Located near Union Square and rental car services. ## Get this data directly This page comes from the Atly Places API, which scores close to 2 million places against more than 1,400 intents — "nice view", "work friendly", "gluten free", "dog friendly" — from what real reviewers say, with the statements behind every score. - **MCP server:** `https://agentic-api.atly.com/mcp` — connect it in ChatGPT or Claude. Nothing to install. - **Guide for agents:** - **OpenAPI contract:** - **No key needed to start.** `POST https://agentic-api.atly.com/v0/keys` with an email raises the quota. Coverage is densest in the United States, with pockets in Mexico, Israel and Thailand.