They're WiFi now, so it's simpler (if you have Internet access for the box that gets the readings.)I'd do it since in PDX water/sewer is close to $100/unit/mon for 2 beds. 

In fact, if you were to type your question in the search box here on BP, you will find that this question has been answered several different times and ways.

I have one that I have closed many house hacking sales with (my own house hack included), and checks off all of the boxes above as well.

But if you are only approved for max $250,000 loan amount, then that's the max you can go.Just go to HUD.gov and enter in the search box "FHA Maximum Loan Limits" and the search results will take you to the appropriate section of HUD.gov so that you can see the FHA max loan limits for the county where the subject property is located. 

It helps to have accumulated some of that mysterious passive income. 

I keep a new water heater in a box in one of my properties in case I need to replace one on a holiday or the plumbing supply place is out.Regular maintenance items are furnace filters, seasonal activations of basement/crawlspace heating, distributing salt buckets, and gutter cleaning. 

Here are some recommendations for you:Find and connect with other BP members that are in your area: https://www.biggerpockets.com/search/usersSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: https://www.biggerpockets.com/podcastIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

Can I just write the letter and place it in their mail box or do I need to have it certified? 

Here are some recommendations for you: Find and connect with other BP members that are in your area: https://www.biggerpockets.com/search/usersSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: https://www.biggerpockets.com/podcastIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

@Jason Collins I love how your thinking outside the box!