Just to add my 2 cents worth, I covered numerous theater openings and closings over at Cinema Treasures, and over a period of time, I saw the same theaters that had reopened with great fanfare closing after 6-18 months after draining the lifesavings of their owners. There is a reason why some theaters have been closed for a decade or more. The marketplace has changed and the economic model has changed. Audiences now expect to see movies either at a 20-screen megaplex or in their home theaters. And you have to be a genius and a gambler to be able to make a single-screen theater work. Becoming a non-profit also helps where you can get rich people to donate money to it (and never actually come to see a movie.)
Also keep in mind that walking around town and asking people if they would like to see the old theater re-open does not mean these people would actually go to the theater. Everyone would like to see an old theater re-open, but they may not come because they don't like the movies you can get, there may not be convenient parking, the admission price is too expensive, or any number of other reasons.
One big factor against re-opening an old theater is that the heating and air conditioning bills will kill your profits. The cost for energy is prohibitively expensive and people won't put up with an unheated or non-air-conditioned theater.
But probably the biggest problem is actually getting good movies. If you're too close to a megaplex, it will get all of the first-run Hollywood movies and shut you out. If you're able to get first-run movies, you will find you have to play them for a certain number of weeks. In most cases, your audience will decline by 50% a week, so you might pack your theater the first week with a Batman movie, but you're playing to a half house the second week, and a quarter house the third week. (This is why many theaters carve out a couple of small viewing rooms either in back of the stage or up in a balcony - to have a place to move movies to as the audience declines.) If the distributors would allow you to play a blockbuster movie each week, you could survive and profit, but that's not the way the game is played.
If you want to go with old movies, you have a big problem because the studios aren't making prints available of their classic films. The market is in home video and the studios aren't interested in making a measly $250 a week rental.
In my analysis, the only one and two-screen theaters that survive are the ones that have gone non-profit, or are in communities where the theater has operated continuously and the people have built up a habit of going there. In about 5% of cases where people have experienced success in re-opening a theater, the owners have had to be marketing geniuses, using their theaters for concerts and other entertainment, as well has installing cafes and restaurants in their lobbies to maximize potential profit. In almost all cases, the theater has had attached apartments, stores and/or offices that bring in money during business recessions and droughts.
I don't want to sound like a downer, but for most people re-opening an old theater is a dream that quickly turns into a nightmare. So you have to be really careful and do some solid business research into whether a theater can succeed in the market it's in. Theater admissions are actually falling each year, so you have to figure out ways of getting people into your theater, which many times involves programming something other than movies or getting into the food business. You have to have your eyes fully open if you want to re-open an old theater.