condo dimensions? single floor or duplex?
what router u used so far?
what broadband speed?
how many and what devices u use? old, new, cheap, high end?
mostly on wifi?

u did not state dimensions... i assume it is squarish, max diagonal 50ft.

single floor, high rise, max 50ft, 100mbps... asus rt1300uhp should be able to do what u want.

the only thing u shud check is how many devices u have that can work on 5ghz.

with 5ghz, u will get full 100mbps wifi or just below.

for laptops and pc's, u can buy ac adaptor to run on 5ghz.

however, if a device can only run on 2.4ghz, expect to get 20-50 only.

and 2.4ghz can be congested in highrise; u may need to play around to find the best channel.

this router is good for wifi up to 300mbps so u can upgrade speed in future.

beyond that, good for ethernet only, wifi will not improve; u need to buy costly router, those that look like spiders with 8 legs.

i am using this router, which has better wifi than tplink ac1200 and dlink 842.

using it for 15 months now, from 100mbps to now 800mbps, very satisfied.
compared to tplink 1200 and dlink842 which i have used before, rtac1300uhp is more stable and better wifi coverage.
but like i said, ethernet 800 is fine, wifi max 300.

i get good 5ghz at 50ft same floor, thru 1 staircase, 1 wall, furniture/cabinets.
that's why i think it will be ok for yr case.
surely there are better wifi routers but for 100mbps and yr layout, i think not worth it.

if u do buy the router, make sure u update to this latest firmware:
RT-AC1300UHP_3.0.0.4_380_8457-g43a391a.trx
u can visit asus thread too:
https://forum.lowyat.net/topic/2651405/+10000#bottom