If you don't care about growing anymore or getting the most returns possible, then it is fine to leave it just in case every one of them has an issue at the same time.

Even if my offer isn't accepted or things don't work out for other reasons it's been a good exercise, as a newbie, trying to assess the costs and potential returns of the two different options.

Keep in mind that some, such as Internal Rate of Return (IRR), require advanced computer calculation.https://www.biggerpockets.com/blogs/8814/73755-18-essential-metrics-to-a-complete-real-estate-investment-analysisAs far as finding multifamily properties, you'd find them the same way you find a SFR, and there are many, many ways to source them:By building relationships and letting everyone know you're looking for houses and apartments:https://www.biggerpockets.com/blogs/8814/72664-35-relationships-to-help-you-find-more-houses-to-flip-or-wholesaleLooking for them on the internet:https://www.biggerpockets.com/blogs/8814/72016-55-resources-to-find-real-estate-deals-onlineand, of course, locating them offline:https://www.biggerpockets.com/blogs/8814/71506-27-ways-to-find-off-market-and-wholesale-real-estate-deals-offlineBest of luck!

Tenants expressed serious concern that they are hearing little girls voices and finding items moved or things out of place.

But generally I think you're looking at lower returns in the mid-term.

I would need more information on your goals, expected return, budget, Etc. before suggesting areas.

Biggest concern with any of the spreadsheets you download off the internet: nobody shows you monthly returns.

If you are looking for a long-term option, it would probably do the best for you in terms of total returns.

If they are going to exchange it, then I would generally assume they are more willing to do so for something in return.

You will meet a nice girl and get married and have kids and you will want a nice brand new 3000 sq ft house in the suburbs.