As far as the best place to buy a multi-family in NJ, I would recommend focusing on areas with good transportation and access to employment.  

Should be around 800-1000 (ie 4 hrs ar 120 + 300 transport, or 8 hrs at 100 + 200 transport), more cleaner works.

You need to look closely at not only the numbers, but the environment (neighborhood, demographics, crime, access to services (bus, transportation, etc.) and proximity to jobs). 

It is the third largest MSA in PA (~650K residents, ~875K projected by 2040), 68th in the entire USA. 4.4% Seasonally Adjusted Unemployment Rate in January (Decrease of 1 percent over the year), which is better than the total USA.Jobs and incomeJob growth was 0.9% over the year.Job growth in the past 5 years has been particularly high in Healthcare & Social Assistance (5,758 jobs or 12% growth) Transportation & Warehousing (4,567 jobs or 32% growth), and Arts, Entertainment & Recreation (3,877 jobs or 54% growth) according to the Lehigh Valley Economic Development Corporation (LVEDC).

EnergyNo state taxesPro-businessPanama CanalPort citiesCoastal areaFarming area (farming was huge last year)Cheap foreign laborTech hub (Austin)Conservative politicsReligious coreHighway access (transportation)Centrally locatedYouthful and energetic (Austin, Dallas)Higher ed (UT, TCU, A&M, TSU, Baylor etcEducation (13-15 students per class)Cultural significance (New dream state)Affordable housing (American dream)Raw landSports (hunting, fishing, racing, NFL etc.)Theatre and artsPoliticsThis is not all inclusive but Texas ranks high or top in all of these areas compared to other states.

People who are in the market for a home prioritized safety even over price when considering a neighborhood.There is also evidence that homes close to public transportation command higher prices.

If you focus on the following, you can probably reduce your risk and not have to worry about the area getting worse for a long time:-access to public transportation, job and population trends, rent growth, vacant housing stock in the area, quality of school districtFor example....If you're planning to invest in a town with one large major employer (say a manufacturer) and that employer goes out of business or has a mass layoff due to an economic downturn, it doesn't matter if you own single families or multifamilies......there isn't going to be anyone to rent your units or buy your property.  99% of the time, a diversified local employment base is better (or atleast one that has many employers that are downturn resistant - health care, education, government, etc.) 

If you are using the vehicle to make deliveries or transport tools and materials to a construction site. 2.

Modular homes are typically constructed at a manufacturing plant or facility, in 3 or more pieces, and then transported to a permanent site on a flatbed truck to be assembled on a permanent foundation.

I used to own a taxi/limousine company and literally I got 90% of my information on getting started directly from the Department of Transportation.