They're all working until at least age 60 and paying lots in federal taxes.

Its a Colorado-specific situation, I guess I should have been more specific:Portable tenant screening reports (PTSR) pursuant to HB23-1099 § 38-12-902(2.5).(2.5) "PORTABLE TENANT SCREENING REPORT" OR "SCREENINGREPORT" MEANS A CONSUMER REPORT PREPARED AT THE REQUEST ANDEXPENSE OF A PROSPECTIVE TENANT BY A CONSUMER REPORTING AGENCY,WHICH REPORT INCLUDES THE FOLLOWING INFORMATION ABOUT APROSPECTIVE TENANT AND THE DATE THROUGH WHICH THE INFORMATIONCONTAINED IN THE REPORT IS CURRENT:(a) NAME;(b) CONTACT INFORMATION;(c) VERIFICATION OF EMPLOYMENT AND INCOME;(d) LAST-KNOWN ADDRESS;(e) FOR EACH JURISDICTION INDICATED IN THE CONSUMER REPORT.....Link to the full Bill

Lenders will require a US entity, bank account, passport, and verification of credit history in Canada 

You and I both could build ground up, but at my age I sure wouldn't want to, much less deal with the city.

My partners and I have a property under agreement, however we are both under the age of 55. 

But I began this reply with IF, because if they are all cash-flow positive, I would personally not seek to pay any of them off early (depending on your age), and instead save that money to put towards obtaining additional properties.

Not only were the phone numbers, addresses, and email addresses better, I was getting a much more complete data set showing me DECEASED indicators and ages as well as the names and associates of relatives I could contact.    

I'm teaching folks from ages 15 to 60+, some of whom have no net worth or a negative net worth.

This could become the basis for taxation.There are multiple methodologies that are utilized by the tax assessor when determining a property's assessed value and which one is utilized is dependent on age, property type, region and other factors.

The original insurances are covering the original purchase price of the properties, which are 25% of the worth in this day and age.