For those who have a lot of cash or can get credit, this could be an ideal time to buy a house -- the foreclosure crisis has pushed prices down and interest rates are way low.

But beware if you are looking to buy a condominium, co-op, town house or other property that's part of a homeownership group. Another side effect of the foreclosure crisis is that you could end up responsible for some of your neighbors' bills.

That's because people in shared ownership communities chip in to pay the cost of maintaining the buildings and amenities such as swimming pools. Also, the funds, usually paid in monthly installments, are often used to pay for landscaping, as well as to insure the structures.

But when individual owners in a group walk away from their homes or lose them to foreclosures, the bills end up getting split by the remaining homeowners.

Sometimes those costs don't get passed on immediately. Instead associations have been known to let bills pile up, creating potentially devastating surprises for owners.

"There's really a crisis within a crisis in the shared ownership community," said Gary Poliakoff, coauthor of "New Neighborhoods: The Consumer's Guide to Condominium, Co-op and HOA Living."

The Community Associations Institute (CAI) trade group recently reported that more than half of the nation's 310,000 community associations are struggling with "serious" or "severe" financial woes.

Some 59 percent of association managers reported that more than 3 percent of homes in their community groups were vacant, the study said, because the owners either had walked away from their mortgages or were unable to rent the homes. Some 65 percent of associations reported that more than 5 percent of their homeowners were delinquent on their monthly assessments.

"When some owners, including banks that have foreclosed on homes and now own them, don't pay their share, other homeowners often must make up the difference through higher regular assessments or special assessments," said Thomas M. Skiba, chief executive of the trade group.

If an association determines that it needs to levy a special assessment on homeowners, there's no legal limit on how high that assessment can be. Unlike rent, homeowner dues aren't subject to price controls.

And homeowners can't just decide not to pay. Associations can get legal judgments to allow them to take a portion of homeowners' wages or put liens on their properties.

"You are an owner, not a tenant," Poliakoff said. "You are responsible for paying a share of the expenses, no matter how high they might be."