I used to research and buy foreclosures. The problem is finding one where there is equity. The interest in a mortgage is front-loaded, and most defaults occur in the first five years, where there is no equity. To make money, you need to find a foreclosure with 30% equity; 50% is better. It's not easy. Also, most people who allow the home to go into foreclosure don't treat it very well. The 30% number comes from what banks usually consider as the breakeven to repo and re-sell the house.
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http://www.sosuave.net/forum/showthread.php?t=87462&highlight=equity+foreclosure
Here's how foreclosure investing works (it will vary some from county-to-county):
The Lis Pendens is the very first foreclosure notice. Get the list when it first comes out. Using the numbers that come with it, look for very old mortgages going into foreclosure. What you want is equity. Maybe 1-2% will be worthy of looking further. Most people go into foreclosure early on, and since the interest is front-loaded, they have no equity. You are looking for at least 30% equity (rough number). 50% is better.
If there is equity, the next step is a lien search, usually in the same building. Make friends with the overworked people who work there, and they will teach you what you need to know. Many people in foreclosure also owe a lot of other bills. The lien amounts must be subtracted from the equity. IRS liens must be paid in full. Other liens are usually negotiable. Sometimes they are happy to get any money.
If there is equity and no/few liens, the next step is getting in touch with the owner. I find the house and knock on the door. (after selling Kirby vacuum cleaners, stuff like this is easy) They usually did not know that foreclosure had been filed, I got to them that quickly. One lady started bawling. The sales pitch is that if they do nothing, they lose all of their equity to the bank. If they sell the house to the investors for whom I work, they can walk away with several thousand in cash and stop the foreclosure. If they absolutely will not deal, the final card that you play is a lease-option. They sell me the house, rent for six months, and then they have the option to buy but must obtain outside financing from a bank. This gives them a chance, but realistically, if foreclosure happened once it will happen again. Usually, you will end up having to evict people from their homes, which can be troubling, but you end up making the foreclosure profit that the bank would have made.
The key to this method is speed and hustle. Often there will be a published newsletter of lis pendens info for investors, but it takes a week to get printed. You have to find the deal and get the property owner under contract before then. There are easier ways to make money in real estate, but this is a good way to get your feet wet.