To expand on what @Tim Youse said there are two big issues, compliance with the law and reducing your liability.

@Fernan Nava,Very good advice, “Know your market”.So, I am giving myself between now and spring to really evaluate the rent raises.One thing that is driving me to consider the raises, is that I am contemplating taking on exterior porch maintenance, something tenants were tasked with in existing lease but I have had to remind them repeatedly on, with little luck.I have come to find that it is easier to fight monetary vs. compliance issues in evictions court.I therefore want to put a monetary value to items/policies that don't currently have a monetary value.In existing lease tenants are required to keep their immediate exterior areas clean, but somehow either they are just lazy or just flat out stubborn and while yes I could issue a 3-day notice to quit, I choose not to.Instead, I plan to take on that responsibility and simply charge them for it, so I am not wasting my time reminding them of it during next lease term.Less is more in my opinion and I prefer an approach where I have more chance of success in evictions court.Up the price and take care of the exterior 3 times during the lease term and I don’t have to worry about it while at the same time I get to maintain curb appeal and keep pests away which is my biggest concern.

Also, observe their compliance with other terms of the rental agreement.

The city of Portland is starting to actively crack down on those who aren't in compliance with regulations (many!).

Preparing your tax return is simply a compliance exercise.

It is their compliance department that needs to retain such records and provide reporting on form 5498.For most investors, the value is just that, a number with little real meaning. 

Any city attempting to limit or reduce a homeowner's ability to build an ADU that is in compliance with state law would open themselves up to a law suit from the STATE of CA, not just the homeowner.

Also, check your state laws to make sure you are in compliance with handling of SD.

The reason for flood zones is obvious.  100 year old homes 1) are hard to keep in rental standard compliance and 2)  tend to be so poorly insulated that tenants don’t stay after a lease term because of the utility cost.

If the seller had fixed everything he promised to fix on the legally binding repair addendum with 100% accuracy and code compliance, we would have said yes in a heartbeat and we would be closing this week.We have not gotten a letter from an attorney.