It depends on your policy.
Are you first run, art or subrun? If first run or art, the more screens the better. If subrun, I think the best number of screens is one, yes 1, numeral uno. If you are a newer theatre, and my definition of newer is having been built after 1950, then regardless of your policy, more screens is probably better as you will probably have nothing to offer other then the pictures you exhibit. As the theatre IS an old one built in 1928, the ambiance of the older theatre could go a long way in making your theatre something special, but twinning it would ruin that possibility.
I own a 557 seat single that opened in 1933, and I book a number of other old singles screens as well. I also book several twin and triplex houses. The multiscreen houses for the most part gross less for all screens combined then the singles do. If you have a single screen subrun you should know that there are often times when it is difficult to find even one good picture to fill that screen. What would you put on that other screen that will pay its way?
As you are in New Jersey and I'm in eastern Pennsylvania, maybe you should come and visit my theatre and see just what you can do with a single screen.
[This message has been edited by RoxyVaudeville (edited September 02, 2007).]