I have invested a total of $285K in... a beach front lot 2016 and beach front condo 2017; both in Brazil.

Even in appreciating cities like Columbus you can still buy duplexes and quads that reach the 1% rule. 

Buying a duplex-quadplex is going to be your best in terms of cash-flow though.

I am a new landlord of a condo and am curious about my tax write off's. 

A few good ones to consider are: an oil tank sweep if the property was built before 1980, a radon test, particularly for basement condos or units, a mold test, a sewer scope, and a termite or pest inspection.General home inspectors often offer some of these as add-on's, but keep in mind that they might not be as thorough as a specialist.

(assuming the cash flow is higher than PITI).My second question is if I acquired a duplex via seller financing, would that also decrease my DTI?

I have a duplex that I haven’t even seen that.

For example, we converted an office structure into a duplex, which forced appreciation and positive cash flow.

I bought my first rental duplex and one very important feature was that it came with a 2nd lot i could build on in the future or sell if i needed more cash during the renovations. 

Ready to sell and invest in house, condo, or multi-family with good ROI and future growth.What made you interested in investing in this type of deal?