How much to put towards cap ex savings account?

[Account Closed]

Hi there, 

We are trying to decide how much to hold in our cap ex savings account for two rental properties.  Both properties are in good shape and we don't anticipate any big expenses soon but we want to be prepared.   Right now we plan to save 10% of each rental income to put towards cap ex and max out the account at 10K.  Does this seem too low/high?  Would love any thoughts on the subject.  Thanks!