I think once you do it full time as your primary source of income, then it probably would be advisable to upgrade and get some software. 

You mentioned a house price of 400K and a monthly rent of 2.5K  If we calculate based on these figures, then your rental yield is only 6.25% (2.5K*12/400K)(2.5K×12)/400K×100% = 6.25% Generally speaking, an ideal rental yield is around 8%-10%Consider renovating and upgrading to increase rental income or using financial tools such as mortgages to optimize cash flow.

The family upgrade, the "just because" bigger home buyer, the empty nester downgrades, the 2nd home, etc are choosing to wait and see, due to news of inflation and interest rates.

It's wise to take into account market research and any upgrades or additional benefits for the tenant.Determining when to raise the rent is influenced by various factors such as lease renewal dates, local market conditions, tenant satisfaction, and lease agreements.

Upgrade to newer!

Technological Enhancements: What technology upgrades have you made to improve the efficiency and customer service of your business, and what impact have these had on your sales and customer satisfaction?

I have plans to upgrade the interior as I’ve heard about the “live and flip” concept from a bigger pockets podcast episode about getting started in real estate.

Broken leg due to a fall down rotted steps

There're lot of family that rather renting as long as their kid is within this school district.and here's another story, this is a condo that was 1.2 mil in 2016 and recently sold for 600k-ish in best location in the world (for the homeless lol) :https://www.redfin.com/CA/San-Francisco/1075-Market-St-94103... so yea, school district and local gov. has huge impact of condo appreciation (and de-appreciation) lol also if on want sample of condo complex that the HOA is simply broken and the homeowner is basically wiped out, there're bunch of them in Concord. 

Also, their PDF download links are broken so I can't read anything about it.