If you're looking in this type of area, you are averaging as many as 50 houses on a block. Having 8% of them for sale is a result of a couple of things.
One is that there is a large aging population in the Northeast because the homes were good for people to raise families in, and then inexpensive enough for them to stay in after the children were grown.
The second is that there is about 9 months supply on the market instead of the balanced amount of 6 months inventory. That means a good selection for a potential buyer, and with rates as low as they are, now is a great time to buy a home.
Please see the link below to see my blog where i discuss this alittle further. or go to my company website at www.c21ag. com . As Philadelphia's largest Century 21 firm, with two offices not 10 minutes from where you're looking we have plenty of agents with good information for you. If there were something unusual in the block causing sellers to want to move, there would e far more then four homes for sale.
Just take your time, choose a good agent who is local to the area, and buy your next home.