Southern border is more flexible.

Partnerships, good agents and property managers are critical when purchasing across borders. 

Since the tax assessment process varies so widely around the country or county or region (and in some places even from town to town that border each other).

Look into de minimus rule as well.

but the speculators of the day especially in the high desert out of LA always sold it that it would be the Next LA  well they been saying that for 100 years.. although Palmdale Lancaster has grown to be 50k populations maybe more and people drive into LA to work.. and Edwards airbase is there and it ebbs and flows with govmit jobs.. but most of the other areas are all what we call recreational lands  surrounded by nothing and or border vast tracts of BLM  and State lands and federal lands  be them state parks or federal parks.. just google it.. you will see.one needs to understand in your area lands were divided and lived on starting in the 1600s or earlier in some cases and well established in the 1700 and 1800s  these areas in those areas were still lands of Mexico in some instances and or Spanish land grants.

Here are a couple to start with: I simply got these off the web so I have no idea how reputable they are but try them and see Bankers Title Corporation Parque Centro 1500 San Juan, PR 00918 787 * 753 * 0339 Efrain Tirado Appraisal Group P S C 1431 Avenue Ponce De Leon 801 San Juan, PR 00907 Estudios De Titulo Ana Echevarria Investigacion 102 Torres San Crst 204 Ponce, PR 00780 Finca Galateo Limited Partnership 207 Calle Tetuan San Juan, PR 00901 Garcia Andres Rivera 555 Prira Leal Street Apartment 201 San Juan, PR 00923 787   531-1179 Ocean Park L P 207 Calle Tetuan San Juan, PR 00901 San Juan Abstract Seguro Titulos 259 Calle Chile San Juan, PR 00917 William Negron Quinones 402 Calle 2 San Juan, PR 00923

I travel frequently to Newark, Delaware for work though, so my initial search area is the area west of I-476 in PA to Newark, DE.

It is in Folsom PA in Delaware County.

These specific products are called either Delaware Statutory trusts or Tenants in Common (TIC) products.  

There is a tax rule called de minimis, stating any improvement under a certain threshold can be taken off as a repair instead.