With inflation and unstable supply and demand makes it hard to keep stable.

Wages not keeping up with inflation, so people only have so much $ unless of another government bailout

In Charlotte, NC and in Charleston, SC, we have such an extreme lack of inventory, especially at the lower end of affordability- seller's aren't giving up their 2.99% interest rate to downsize and pay more for a home with a higher rate, so they are staying on the sidelines. and Builders cannot ramp up fast enough, and are being very cautious due to interest rates, coupled with inflation, where their goods and services also cost more to build homes- and, after 2008-2010, where many got burned, and badly, they are super cautious.

I've done both a HELOC and a cash out refinance on my current house to buy my 9 units and it may not be the most efficient way to purchase but it has allowed me to own 2.5 million in real estate and have 500k in equity that will grow at 3% or $75k a year with normal inflation.   

It's definitely going to be more difficult in this market to cashflow on Long Term Rentals, but parking your cash into real estate is still a great long term mindset to beat inflation.

We're thus able to evaluate our rates, and keep pace with inflation, on a monthly and quarterly basis.

Real estate investment is parking money as equity for appreciation, tax benefit and hopefully cash flow and inflation hedges. 

These factors would include the numbers of properties that can be managed efficiently; the amount of capital their acquisition consumes (which is function of their down payment and financing terms), the quality and durability of the income stream they produce both in times of inflation and recession, their fiscal independence from government subsidies, and the time one must spend puffing out fires in order to continue to function.

This gives the Owner the best of all worlds - SF or STR/LTR - enabling keeping the home affordable for home owner while also providing an affordable place for a friend or family member to live, all while having privacy for both.The 30% is just the difference between the total of my experienced estimate of what the build would have cost just 3 or 4 years ago plus a factor for the current period of inflation, versus the total of the bids that came in. 

Plus, if a unit is vacant, you lose part of your potential income, which might be more impactful compared to having multiple units in a larger property.Market Limitations: Depending on the Lubbock market, there might be a limited number of duplexes available, which can restrict your options or inflate prices due to high demand.Resale Market: Duplexes might not appreciate as rapidly as single-family homes, depending on the area and market trends.Hope that gets you started, shoot any questions you have my way!