I have a number of WNY properties, In Buffalo, 2 duplexes and one single unit. and in Rochester 1 duplex and 3 single units.
I have mixed experience and have learnt a lot. Your Property Manager is everything. There are 2 things which cost you dear.
1. Empty units.
On an empty unit you pay double the insurance, You continue to pay the local taxes. You pay a months rental to the PM when they find you a tenant. You are at risk.
2. repairs between tenants.
If you evict, they have not paid you and they trash the property. If they leave, they dont pay the rent and they trash the joint.
9 of the 10 rental units I have were bought with 'paying tenants' By the time I had evicted them all for non payment, refurbished the property and relet, I had taken on average a 6 month hit! The one property I bought vacant was let within 2 months and has been earning ever since. That 6 month void on 9 properties was a $30k hit! Through it now but it will be a while before I compensate for the hit.
Things you learn
1. out of the fantastic yield you have to pay
all local taxes
insurance
registration
lawn cutting
water bills
with duplexes - common electrics
repairs
maintenance
section 8 inspections and repairs
violations
management fees
new tenant fees
vandalism
Having said all that given a fair wind you could have a net yield of 10 - 15 %