You pay your agent at closing (think of it as an additional closing cost) Depending of the situation and of these options can be used by you and your agent to negotiate with the seller.

This designation doesn’t cost extra or give the manager access to insurance payouts but ensures you and the property manager are aligned during incidents, such as tenant lawsuits or insurance claims.

Screening everyone over 18 helps reduce the risk of costly evictions and ensures you’re fully informed about who will be living in your property.Additionally, be mindful of the number of occupants and how it might impact your property.

If it's more complicated eviction.com may be your best bet to use they are pretty cost effective.

Is just the fact that no garage could be a no go for some buyers enough to build it even if it only raises the value by the actual cost?

More units usually is better, but costs more.

In southern CA, even garage conversion ADU additions are typically costing more than the value added.  

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Seems like it's in a lower end area so if it is filled you will have tenant issues and turnover cost.

Most likely your insurance deductible will be more than that and an attorney will definitely cost you more than that.