You have to get out of Conventionals where the DTI will limit your further growth and get into Commercial loans. 

BUT, hopefully you are getting rent growth in those 10 years which would make an exact analysis very very hard do.  

So far: quarterly % change in Real GDP, YOY % Change in Monthly home prices, job growth, interest rates, population shifts, rising wages, area revitalization, relocation, marriage, family growth, divorce, death, debt, active inventory, sold homes, avg. sold price, average days on market, Concentrations of jobs by occupational category, average level of education, school rankings, crime, appreciation, property tax rate, state tax rate, positive/negative RE legislation, monthly rental income, average age, inflation, popular property types and configurations, vacancy rates, volume of rental units added to market, time to rent, months of supply, volume of new home construction. 

To take it a step further you can research zip code demographics, local crime data, schools and education, and job growth.

Arpan Patel what happens when you buy wrong on a long term hold but appreciation/rent growth is stagnant (or worse)?

He's helped me immensely and I'm hoping it's the beginning of a long and profitable business relationship.

Rather than macro trends, we look at local SFR trends, Multifamily building permits, income growth, population growth, job growth, hyper-local competition, and interest rates. 

Each property you buy will depend on the income and equity of the last, so you need to be very careful and informed about your house of cards and have someone who can recommend the most strategic next move without putting you in peril while maximizing your growth.  

There are many homes for sale in these areas, demographics are changing and there is definitely growth potential.Kind Regards,Liz

The growth has been phenomenal.