I greatly appreciate all the responses and your expertise.
Sometimes an agent may hire a sign company which is prompt to put it up (they will loose business if they are slow) but is slower to take it down (the buyer is the first to complain and they didn't hire the sign company).
Palo Alto home values are given at http://julianalee.com/palo-alto/palo-alto-statistics.htm
Top 3 agent for 3 years nationwide at Keller Williams Realty, the nations largest
Over 20 years experience
Over 1,000 homes sold in Santa Clara County and San Mateo County
All the best to you.
As other mentioned, after sale the sign helps the agent get additional business. If you like the work your agent did for you keeping the sign in a visible spot seems like an easy way to show your gratitude.
Ask your agent to move or remove the sign if you wish to so so.
You can choose to have NO SIGN at all, its your home sale, your call, you can have it moved to anywhere you want....nothing mandatory that you have to have a sign at all....the Sign is for your Realtor to perhaps get more sale business that he/she was able to sell yours that quickly...
All the best,