PrivateLets wasn't a business plan. It was a spreadsheet that kept breaking, then a slightly better spreadsheet, then a small script, then something I was embarrassed to call software, then something I wasn't.
I own a handful of rental properties. Somewhere around year two of managing them myself I realized I was spending more time fighting my own tools than dealing with actual tenants. The tools were the problem. So I started building the thing I actually needed, for me, with no plan to ever show it to anyone else.
Ten years and more rewrites than I can count later, it's still built that way. A feature goes in because I hit the problem myself, running my own portfolio, not because a sales call surfaced a request. That's a small sample size and I know it. It's also the only honesty check I trust.
The tradeoff is real: I will never have a roadmap as long as a company with a product team and a backlog. What I have instead is a piece of software that has survived contact with an actual landlord's actual Tuesday for a decade, because it had to.
If you manage a handful of doors yourself, that's probably closer to what you need than what a venture-backed platform built for a 500-unit management company is selling you.