Sellers will lie to you and you have to "trust but verify"It's your problem.

My problem is how to measure if it has any impact on sales price or time on market. 

The seller is selling because of problems they may be facing. 

The person checking the unit just said needs replacing so we did but it did not solve the issue. $6000 repair. 

Additionally, if you’re not local, requesting photos or videos of the problem can provide clarity before approving expensive repairs.For the lead paint testing, it’s important to determine whether this is a compliance requirement or a proactive measure.

Adding in the layer of not being on the loan but holding title just sounds like it will eventually lead to problems like OP experienced.

The problem is thinking when you are starting out that you should use 100% OPM. 

The point of the questions above is to emphasize that renting out by the room increases your chances for more problems.

The renovation aimed to modernize the property, enhance its appeal to potential tenants, and maximize its long-term value.

I always need to remind myself about that, because I also (like many millenials) have a problem remembering what my bigger picture goals are, so I tend to want to sprint so that I don't forget and hence lose myself in the flywheel that is day-to-day living.