Just found this little gem today and boy am I glad I did. I've barely noticed the building during my many trips past this place. You order your food outside through a a tiny window and there is no seating, so take out only, and they only take cash. Let me tell you, it is worth it!
I ordered the Pepper Steak lunch special. The pepper steak has tender beef, green peppers, carrots, onions and peppercorns with a delightful sauce. You get a large portion of the entree, a mound of fried rice, a yummy egg roll and a fried wonton. You get all of this for just under $5.00 and it was ready in under 15 minutes. Big win!
This place is so close to my work and has been there for long time. I'm only sad I didn't find it sooner! You can find their menu online if you search "tam's chinese food phoenix". Definitely a hit in our office! I highly recommend it.