Rossmoor, Northern California or Rossmoor, Southern California? In So Ca, 200K will get nothing in Rossmoor short of maybe a 1 bedroom converted apartment. Otherwise you might mean Leisure World in Seal Beach which is just across the freeway from Rossmoor.
This is a senior community and $200K will afford many of the listings in there. It is a great retirement community and the HOAs average right around $500 a month but that includes appliance repairs, replacements and amenities galore. If it is the So Cal one, you can view the listings there at http://www.400kHomes.com. Good luck !