Views, indoor pools, game rooms and proximity to attractions.

If one or more units are vacant, the remaining units often don’t provide enough cash flow to cover expenses, making it harder to meet operating costs.Maintenance costs: A fourplex comes with four times the appliances, plumbing, HVAC systems, and other components to maintain, leading to significantly higher repair and maintenance expenses than single-family homes.If you want to see the detailed calculation, read this BP blog - More Units Doesn’t Mean More Money—Why a Single-Family Home Can Beat a Fourplex.Resale value: Multi-family properties have a limited buyer pool—mainly investors—who base their offers on CAP rates.

I grabbed my multi meter and showed them the voltage in the water . 

They were never particularly nice, beach cabins on stilts with rattan furniture that usually had water stains from wet suits.  

This resulted in longer times to re-rent and well as reducing the rental pool.

Shared laundry meant a fifth utility meter and high water costs that I paid.

If you can attend local investor meetups, that’s a great way to gain market insight and connect with reliable people.It’s also smart to start small with a couple of flips to test the waters, and make sure you understand the local market dynamics before scaling up.Good luck with your expansion! 

This has a cost but nothing close to what you’d have to pay investors in a pool, which is something else you mentioned.

Are there separate gas, electric and water meters for each apartment?

Pretty often no water, sewer, power or even roads to the property.