Some places do this annually, some places do a portion of the town every year giving them a total cycle of about every 4 years, and in my area it’s common to do a whole town reevaluation every 4-5 years.

Quote from @Evan Ross: One of the most common mistakes I see with amateur landlords: attempting to build goodwill with their tenants.

At the end i will add a list of items why adding a single ADU in single family zoned areas may not be the best RE option.The most common value add is via a rehab.  

U only have to be burned once when title comes back 3 days before closing ( which can be very common in abstractor  states ) only to find it title is buggered.. title companies and closing attorneis may have their process's but a good agent just lets them know this is how escrow is going to flow.. they will wine but it cost 200.00 for a title search and we dont want to spend that until we know we have a closing.

If there are clear signs of negligence (kid throws down, paper towels, food, fats) then you can get the invoice from the plumber with the notes and present it to them. 

That means having procedure and protocol for every situation--or at least, every common situation. 

One of the most common mistakes beginners make is jumping into large rehab projects without having a solid team or boots on the ground. 

Lack of provisions for dispute resolution is a common oversight.

Hard money is a pretty common loan type for BRRRs or flips, it is handy to start. 

Ryan Sorry to hear of your situation - I will say it is somewhat common due to the market run up back then.Shoot me your info and let me take a look at all.