We are currently using OneSite for L&R and books for our 3rd party properties and keep to keep the books for our property management company. We have found Onesite to be to slow to adapt to technology, clunky to use, and not good at integrating the L&R and Financial information in one easy to decipher dashboard.
We have begun to look at products such as Appfolio and Propertyware. Can either of these products handle doing the property management company's books as well or do you end up using QB. Ideally we would have 1 unified system which allows us to create bills to be paid out of the property management company's bank account, the expenses hit the particular properties general ledger, and a due to/from is created which is paid back to the property management company at the end of the month.
if you are using these SAAS solutions and aren't doing it that way, I would be interested in knowing what you do