We have seen a property in an prominently Jewish area. It is owned by a Jewish lady whose husband committed suicide almost 8 years ago by overdosing with sleeping pills. We are not Jewish and the house looks good in terms of location. But if we will be reselling it after some years, will this information affect Jewish people's decision on whether to buy it?
There are Jewish communities which have the custom that if a tragedy happened in a home, the current owners will move out.
This is based on the Rabbinic expression "one who changes his location changes his luck".
However, there is no reason for somebody else not to move into such a home. In Jerusalem - and other predominantly Jewish areas - such homes are occasionally put up for sale and do not stay long on the market.
Even if somebody would have a custom not to move into such a home, if it were owned by somebody else since the tragedy then it would be considered "safe", as they are not buying it from anybody related to the tragedy.
That said, you will always find people who are very superstitious and will refuse to even walk near such a home. This has no basis in Judaism, as far as I know.