You can find Siamese Basil Thai at 6034 S Norcross Tucker Rd, Norcross, GA 30093 - this is on the eastern side of Norcross Tucker Rd as it spans between Pleasantdale Rd and Jimmy Carter Blvd. It lies on the northern end of a small shopping center - there's parking out front and to the side but know that it can be a bit limited. I'm not sure how this became part of Norcross - it must be on the very edge of the city boundary.
This is one of two Thai restaurants in the area that is quite well known, having occupied this location for many years - the other is Thai Restaurant of Norcross across the street and further south about a block, which I've heard is one of the oldest Thai restaurants in Atlanta. We usually eat at Thai Restaurant of Norcross (regulars, eating there since the late 90's) but decided to change things up a bit as it has been many, many years since we hit Siamese Basil Thai. This neighborhood is a bit sketch at night, with many pedestrians (some of them quite buzzed) wandering around and crossing the streets in dark clothing - think Buford Highway from 20 years ago in towards Northeast Plaza. There are many small shops and restaurants feeding into many nearby apartment buildings - it's that type of vibe. It's also only a few miles from my neighborhood so I've explored these areas a bit.
The interior of Siamese Basil is a mix of attempted elegance and restaurant function - maybe a bit dated in today's trendy industrial restaurant modern notion. There are chest high walls crenelated to provide views to booths and tables on a checkerboard-tiled floor. Menus are multiple pages with some attempt at color photography for a few representative dishes. Prices range from $4 apps to $15 signature dishes with most in the $10-11 range for your basics.
Since I had been a while we started with shrimp basil rolls with a classic peanut sauce - I thought these were good and a bit unusual to see in a Thai restaurant, being more of a Vietnamese dish. We went from there to a spicy basil chicken, a veg fried rice and a chicken pad thai. I thought all were good and slightly different compared to Thai Restaurant of Norcross - I'd certainly come here again if that option was limited.
Service was very good with the guy at the front very personable as was the attending server. I've since eaten here for lunch with a separate menu that was quite reasonable and included Sushi and Japanese Bento.
(also posted to Yelp)